Connection issue: New Windows PC (SyncTrayzor) fails to sync with Android devices, while old PC works under identical network/proxy setup

[Saunak626]

Description of the issue

Connection issue

Steps to reproduce

I am running a Syncthing setup involving 4 devices:

1. Old Windows PC (running SyncTrayzor)
2. New Windows PC (running SyncTrayzor)
3. Two Android devices (running Syncthing-android)

The Problem
The old Windows PC syncs with the Android devices perfectly. However, the new Windows PC fails to connect or sync with the Android devices.

Network Context

• All devices are on the same local network (connected to the same router).
• Both Windows PCs are using Clash as a system proxy.
• The configuration on both Windows PCs is theoretically similar, but the new one cannot establish a connection with the Android clients.

Questions

1. Given that Clash is running, are there specific conflicts I should look for regarding local discovery on the new machine?
2. What are the recommended steps to debug why the new PC cannot see or transfer data to the Android devices?
3. Since my old PC works fine with Clash, I am not sure if the proxy is the actual cause. Could you advise on what specific settings I should check or modify to troubleshoot this?

App version

v2.0.10.1

App install source - see wiki for details on release channels

GitHub or F-Droid release build

Android version

Android14

ROM vendor

Android14

Device manufacturer

Magic7 Pro

Device model

No response

Device platform info (optional)

2025-11-25 10:35:56 INF QUIC listener shutting down (address="[::]:22000" log.pkg=connections)
2025-11-25 10:35:56 INF Relay listener shutting down (id=dynamic+https://relays.syncthing.net/endpoint log.pkg=connections)
2025-11-25 10:35:56 INF Lost device connection (kind=primary device=SQNQS2I connection=192.168.5.249:22000-192.168.5.187:22000/tcp-server/TLS1.3-TLS_AES_128_GCM_SHA256/LAN-P10-63R3S4431G78G3GPST2OETO4HS error="Syncthing is being stopped" remaining=2 log.pkg=model)
2025-11-25 10:35:56 INF Lost device connection (kind=secondary device=SQNQS2I connection=192.168.5.249:22000-192.168.5.187:63083/tcp-server/TLS1.3-TLS_AES_128_GCM_SHA256/LAN-P10-63R3SCMLLPGL0AAG7H8IAVMEC6 error="Syncthing is being stopped" remaining=1 log.pkg=model)
2025-11-25 10:35:56 INF Lost device connection (kind=secondary device=SQNQS2I connection=192.168.5.249:22000-192.168.5.187:62949/tcp-server/TLS1.3-TLS_AES_128_GCM_SHA256/LAN-P10-63R3S57MSG3HO81CHHFBD5FGM6 error="Syncthing is being stopped" remaining=0 log.pkg=model)
2025-11-25 10:35:56 INF Connection closed (device=SQNQS2I connection=192.168.5.249:22000-192.168.5.187:62949/tcp-server/TLS1.3-TLS_AES_128_GCM_SHA256/LAN-P10-63R3S57MSG3HO81CHHFBD5FGM6 error="Syncthing is being stopped" log.pkg=model)
2025-11-25 10:35:56 INF TCP listener shutting down (address="[::]:22000" log.pkg=connections)
2025-11-25 10:35:56 INF Exiting (log.pkg=syncthing)
2025-11-25 10:35:57 INF Saved log output (path=C:\Users\swq\AppData\Local\Syncthing\syncthing.log log.pkg=main)
2025-11-25 10:35:57 INF syncthing v2.0.11 "Hafnium Hornet" (go1.25.3 windows-amd64) builder@github.syncthing.net 2025-10-27 03:59:48 UTC (log.pkg=main)
2025-11-25 10:35:57 INF Calculated our device ID (device=Q5XVXSC log.pkg=syncthing)
2025-11-25 10:35:57 INF Overall rate limit in use (send="is unlimited" recv="is unlimited" log.pkg=connections)
2025-11-25 10:35:57 INF Using discovery mechanism (identity="global discovery server https://discovery-lookup.syncthing.net/v2/?noannounce" log.pkg=discover)
2025-11-25 10:35:57 INF Using discovery mechanism (identity="global discovery server https://discovery-announce-v4.syncthing.net/v2/?nolookup" log.pkg=discover)
2025-11-25 10:35:57 INF Using discovery mechanism (identity="global discovery server https://discovery-announce-v6.syncthing.net/v2/?nolookup" log.pkg=discover)
2025-11-25 10:35:57 INF Using discovery mechanism (identity="IPv4 local broadcast discovery on port 21027" log.pkg=discover)
2025-11-25 10:35:57 INF Using discovery mechanism (identity="IPv6 local multicast discovery on address [ff12::8384]:21027" log.pkg=discover)
2025-11-25 10:35:57 INF Relay listener starting (id=dynamic+https://relays.syncthing.net/endpoint log.pkg=connections)
2025-11-25 10:35:57 INF Ready to synchronize (folder.label=Saunak_library folder.id=u6sxp-3t5pf folder.type=sendonly log.pkg=model)
2025-11-25 10:35:57 INF GUI and API listening (address=127.0.0.1:8384 log.pkg=api)
2025-11-25 10:35:57 INF Access the GUI via the following URL: http://127.0.0.1:8384/ (log.pkg=api)
2025-11-25 10:35:57 INF Loaded configuration (name=DESKTOP-8NM546Q log.pkg=syncthing)
2025-11-25 10:35:57 INF Loaded peer device configuration (device=SQNQS2I name=LAPTOP-RGURVASI address="[dynamic]" log.pkg=syncthing)
2025-11-25 10:35:57 INF Loaded peer device configuration (device=UJVCEEF name="GT Pro" address="[dynamic]" log.pkg=syncthing)
2025-11-25 10:35:57 INF Loaded peer device configuration (device=FAG3LS3 name=Magic7Pro address="[dynamic]" log.pkg=syncthing)
2025-11-25 10:35:57 INF TCP listener starting (address="[::]:22000" log.pkg=connections)
2025-11-25 10:35:57 INF QUIC listener starting (address="[::]:22000" log.pkg=connections)
2025-11-25 10:35:58 INF Established secure connection (device=SQNQS2I connection.local=192.168.5.249:22000 connection.remote=192.168.5.187:22000 connection.type=tcp-server connection.lan=true connection.crypto=TLS1.3-TLS_AES_128_GCM_SHA256 connection.prio=10 connection.id=63R3TDP4141089BCRBEG7CVA00 log.pkg=connections)
2025-11-25 10:35:58 INF New device connection (device=SQNQS2I address=192.168.5.187:22000 remote.name=LAPTOP-RGURVASI remote.client=syncthing remote.version=v2.0.11 log.pkg=model)
2025-11-25 10:35:58 INF Established secure connection (device=SQNQS2I connection.local=192.168.5.249:22000 connection.remote=192.168.5.187:63763 connection.type=tcp-server connection.lan=true connection.crypto=TLS1.3-TLS_AES_128_GCM_SHA256 connection.prio=10 connection.id=63R3TDPH6A28OEN9L4B3J75964 log.pkg=connections)
2025-11-25 10:35:58 INF Additional device connection (device=SQNQS2I address=192.168.5.187:63763 count=1 log.pkg=model)
2025-11-25 10:35:58 INF Measured hashing performance (perf="2569.47 MB/s" log.pkg=syncthing)
2025-11-25 10:35:58 INF Completed initial scan (folder.label=Saunak_library folder.id=u6sxp-3t5pf folder.type=sendonly log.pkg=model)
2025-11-25 10:35:59 INF Established secure connection (device=FAG3LS3 connection.local=192.168.5.249:22000 connection.remote=192.168.5.244:22000 connection.type=tcp-client connection.lan=true connection.crypto=TLS1.3-TLS_AES_128_GCM_SHA256 connection.prio=10 connection.id=63R3TE2QF9NFGSLNK8L6B9FIBU log.pkg=connections)
2025-11-25 10:35:59 INF New device connection (device=FAG3LS3 address=192.168.5.244:22000 remote.name="" remote.client=syncthing remote.version=v2.0.10 log.pkg=model)
2025-11-25 10:36:00 INF Lost device connection (kind=primary device=FAG3LS3 connection=192.168.5.249:22000-192.168.5.244:22000/tcp-client/TLS1.3-TLS_AES_128_GCM_SHA256/LAN-P10-63R3TE2QF9NFGSLNK8L6B9FIBU error="reading length: read tcp 192.168.5.249:22000->192.168.5.244:22000: wsarecv: An existing connection was forcibly closed by the remote host." remaining=0 log.pkg=model)
2025-11-25 10:36:00 INF Connection closed (device=FAG3LS3 connection=192.168.5.249:22000-192.168.5.244:22000/tcp-client/TLS1.3-TLS_AES_128_GCM_SHA256/LAN-P10-63R3TE2QF9NFGSLNK8L6B9FIBU error="reading length: read tcp 192.168.5.249:22000->192.168.5.244:22000: wsarecv: An existing connection was forcibly closed by the remote host." log.pkg=model)
2025-11-25 10:36:17 INF Detected NAT services (count=0 log.pkg=nat)
2025-11-25 10:36:30 INF Established secure connection (device=FAG3LS3 connection.local=192.168.5.249:22000 connection.remote=192.168.5.244:22000 connection.type=tcp-client connection.lan=true connection.crypto=TLS1.3-TLS_AES_128_GCM_SHA256 connection.prio=10 connection.id=63R3THKIA8520LQ3LB72RRA9OE log.pkg=connections)
2025-11-25 10:36:30 INF New device connection (device=FAG3LS3 address=192.168.5.244:22000 remote.name="" remote.client=syncthing remote.version=v2.0.10 log.pkg=model)
2025-11-25 10:36:31 INF Lost device connection (kind=primary device=FAG3LS3 connection=192.168.5.249:22000-192.168.5.244:22000/tcp-client/TLS1.3-TLS_AES_128_GCM_SHA256/LAN-P10-63R3THKIA8520LQ3LB72RRA9OE error="reading length: read tcp 192.168.5.249:22000->192.168.5.244:22000: wsarecv: An existing connection was forcibly closed by the remote host." remaining=0 log.pkg=model)
2025-11-25 10:36:31 INF Connection closed (device=FAG3LS3 connection=192.168.5.249:22000-192.168.5.244:22000/tcp-client/TLS1.3-TLS_AES_128_GCM_SHA256/LAN-P10-63R3THKIA8520LQ3LB72RRA9OE error="reading length: read tcp 192.168.5.249:22000->192.168.5.244:22000: wsarecv: An existing connection was forcibly closed by the remote host." log.pkg=model)
2025-11-25 10:36:33 INF Joined relay (uri=relay://125.106.48.53:22067 log.pkg=relay/client)
2025-11-25 10:36:36 INF Detected NAT type (uri=quic://0.0.0.0:22000 type="Port restricted NAT" log.pkg=connections)
2025-11-25 10:36:36 INF Resolved external address (uri=quic://0.0.0.0:22000 address=quic://112.64.75.77:16575 via=stun.internetcalls.com:3478 log.pkg=connections)
2025-11-25 10:36:58 INF Established secure connection (device=SQNQS2I connection.local=192.168.5.249:22000 connection.remote=192.168.5.187:63946 connection.type=tcp-server connection.lan=true connection.crypto=TLS1.3-TLS_AES_128_GCM_SHA256 connection.prio=10 connection.id=63R3TKOQ9T94O881MNR7TSRU04 log.pkg=connections)
2025-11-25 10:36:58 INF Additional device connection (device=SQNQS2I address=192.168.5.187:63946 count=2 log.pkg=model)
2025-11-25 10:37:00 INF Established secure connection (device=FAG3LS3 connection.local=192.168.5.249:22000 connection.remote=192.168.5.244:22000 connection.type=tcp-client connection.lan=true connection.crypto=TLS1.3-TLS_AES_128_GCM_SHA256 connection.prio=10 connection.id=63R3TL5L9QRSO6MSKGH6PQODFI log.pkg=connections)
2025-11-25 10:37:00 INF New device connection (device=FAG3LS3 address=192.168.5.244:22000 remote.name="" remote.client=syncthing remote.version=v2.0.10 log.pkg=model)
2025-11-25 10:37:01 INF Lost device connection (kind=primary device=FAG3LS3 connection=192.168.5.249:22000-192.168.5.244:22000/tcp-client/TLS1.3-TLS_AES_128_GCM_SHA256/LAN-P10-63R3TL5L9QRSO6MSKGH6PQODFI error="reading length: read tcp 192.168.5.249:22000->192.168.5.244:22000: wsarecv: An existing connection was forcibly closed by the remote host." remaining=0 log.pkg=model)
2025-11-25 10:37:01 INF Connection closed (device=FAG3LS3 connection=192.168.5.249:22000-192.168.5.244:22000/tcp-client/TLS1.3-TLS_AES_128_GCM_SHA256/LAN-P10-63R3TL5L9QRSO6MSKGH6PQODFI error="reading length: read tcp 192.168.5.249:22000->192.168.5.244:22000: wsarecv: An existing connection was forcibly closed by the remote host." log.pkg=model)
2025-11-25 10:37:31 INF Established secure connection (device=FAG3LS3 connection.local=192.168.5.249:22000 connection.remote=192.168.5.244:22000 connection.type=tcp-client connection.lan=true connection.crypto=TLS1.3-TLS_AES_128_GCM_SHA256 connection.prio=10 connection.id=63R3TONG1FMCQ3HK9VTCU4I01C log.pkg=connections)
2025-11-25 10:37:31 INF New device connection (device=FAG3LS3 address=192.168.5.244:22000 remote.name="" remote.client=syncthing remote.version=v2.0.10 log.pkg=model)
2025-11-25 10:37:32 INF Lost device connection (kind=primary device=FAG3LS3 connection=192.168.5.249:22000-192.168.5.244:22000/tcp-client/TLS1.3-TLS_AES_128_GCM_SHA256/LAN-P10-63R3TONG1FMCQ3HK9VTCU4I01C error="reading length: read tcp 192.168.5.249:22000->192.168.5.244:22000: wsarecv: An existing connection was forcibly closed by the remote host." remaining=0 log.pkg=model)
2025-11-25 10:37:32 INF Connection closed (device=FAG3LS3 connection=192.168.5.249:22000-192.168.5.244:22000/tcp-client/TLS1.3-TLS_AES_128_GCM_SHA256/LAN-P10-63R3TONG1FMCQ3HK9VTCU4I01C error="reading length: read tcp 192.168.5.249:22000->192.168.5.244:22000: wsarecv: An existing connection was forcibly closed by the remote host." log.pkg=model)
2025-11-25 10:38:01 INF Established secure connection (device=FAG3LS3 connection.local=192.168.5.249:22000 connection.remote=192.168.5.244:22000 connection.type=tcp-client connection.lan=true connection.crypto=TLS1.3-TLS_AES_128_GCM_SHA256 connection.prio=10 connection.id=63R3TS8NTQT3M7RDQ2JPICH782 log.pkg=connections)
2025-11-25 10:38:01 INF New device connection (device=FAG3LS3 address=192.168.5.244:22000 remote.name="" remote.client=syncthing remote.version=v2.0.10 log.pkg=model)
2025-11-25 10:38:02 INF Lost device connection (kind=primary device=FAG3LS3 connection=192.168.5.249:22000-192.168.5.244:22000/tcp-client/TLS1.3-TLS_AES_128_GCM_SHA256/LAN-P10-63R3TS8NTQT3M7RDQ2JPICH782 error="reading length: read tcp 192.168.5.249:22000->192.168.5.244:22000: wsarecv: An existing connection was forcibly closed by the remote host." remaining=0 log.pkg=model)
2025-11-25 10:38:02 INF Connection closed (device=FAG3LS3 connection=192.168.5.249:22000-192.168.5.244:22000/tcp-client/TLS1.3-TLS_AES_128_GCM_SHA256/LAN-P10-63R3TS8NTQT3M7RDQ2JPICH782 error="reading length: read tcp 192.168.5.249:22000->192.168.5.244:22000: wsarecv: An existing connection was forcibly closed by the remote host." log.pkg=model)
2025-11-25 10:38:31 INF Established secure connection (device=FAG3LS3 connection.local=192.168.5.249:22000 connection.remote=192.168.5.244:22000 connection.type=tcp-client connection.lan=true connection.crypto=TLS1.3-TLS_AES_128_GCM_SHA256 connection.prio=10 connection.id=63R3TVQ3RAAD0FONUV5B22O7D2 log.pkg=connections)
2025-11-25 10:38:31 INF New device connection (device=FAG3LS3 address=192.168.5.244:22000 remote.name="" remote.client=syncthing remote.version=v2.0.10 log.pkg=model)
2025-11-25 10:38:32 INF Lost device connection (kind=primary device=FAG3LS3 connection=192.168.5.249:22000-192.168.5.244:22000/tcp-client/TLS1.3-TLS_AES_128_GCM_SHA256/LAN-P10-63R3TVQ3RAAD0FONUV5B22O7D2 error="reading length: read tcp 192.168.5.249:22000->192.168.5.244:22000: wsarecv: An existing connection was forcibly closed by the remote host." remaining=0 log.pkg=model)
2025-11-25 10:38:32 INF Connection closed (device=FAG3LS3 connection=192.168.5.249:22000-192.168.5.244:22000/tcp-client/TLS1.3-TLS_AES_128_GCM_SHA256/LAN-P10-63R3TVQ3RAAD0FONUV5B22O7D2 error="reading length: read tcp 192.168.5.249:22000->192.168.5.244:22000: wsarecv: An existing connection was forcibly closed by the remote host." log.pkg=model)
2025-11-25 10:39:02 INF Established secure connection (device=FAG3LS3 connection.local="[::]:22000" connection.remote=192.168.5.244:22000 connection.type=quic-client connection.lan=true connection.crypto=TLS1.3-TLS_AES_128_GCM_SHA256 connection.prio=20 connection.id=63R3U3BBFLUHG2M0SRT9FUQ058 log.pkg=connections)
2025-11-25 10:39:02 INF New device connection (device=FAG3LS3 address=192.168.5.244:22000 remote.name="" remote.client=syncthing remote.version=v2.0.10 log.pkg=model)
2025-11-25 10:39:03 INF Lost device connection (kind=primary device=FAG3LS3 connection="[::]:22000-192.168.5.244:22000/quic-client/TLS1.3-TLS_AES_128_GCM_SHA256/LAN-P20-63R3U3BBFLUHG2M0SRT9FUQ058" error="reading length: Application error 0x0 (remote): closing" remaining=0 log.pkg=model)
2025-11-25 10:39:03 INF Connection closed (device=FAG3LS3 connection="[::]:22000-192.168.5.244:22000/quic-client/TLS1.3-TLS_AES_128_GCM_SHA256/LAN-P20-63R3U3BBFLUHG2M0SRT9FUQ058" error="reading length: Application error 0x0 (remote): closing" log.pkg=model)
2025-11-25 10:39:22 WRN Failed to exchange Hello messages (device=FAG3LS3 address=192.168.5.244:22000 error="Application error 0x0 (remote): closing" log.pkg=connections)
2025-11-25 10:39:42 INF Established secure connection (device=FAG3LS3 connection.local=192.168.5.249:22000 connection.remote=192.168.5.244:22000 connection.type=tcp-client connection.lan=true connection.crypto=TLS1.3-TLS_AES_128_GCM_SHA256 connection.prio=10 connection.id=63R3U7V1L1VU8MJUV9P7OCF5SS log.pkg=connections)
2025-11-25 10:39:42 INF New device connection (device=FAG3LS3 address=192.168.5.244:22000 remote.name="" remote.client=syncthing remote.version=v2.0.10 log.pkg=model)
2025-11-25 10:39:43 INF Lost device connection (kind=primary device=FAG3LS3 connection=192.168.5.249:22000-192.168.5.244:22000/tcp-client/TLS1.3-TLS_AES_128_GCM_SHA256/LAN-P10-63R3U7V1L1VU8MJUV9P7OCF5SS error="reading length: read tcp 192.168.5.249:22000->192.168.5.244:22000: wsarecv: An existing connection was forcibly closed by the remote host." remaining=0 log.pkg=model)
2025-11-25 10:39:43 INF Connection closed (device=FAG3LS3 connection=192.168.5.249:22000-192.168.5.244:22000/tcp-client/TLS1.3-TLS_AES_128_GCM_SHA256/LAN-P10-63R3U7V1L1VU8MJUV9P7OCF5SS error="reading length: read tcp 192.168.5.249:22000->192.168.5.244:22000: wsarecv: An existing connection was forcibly closed by the remote host." log.pkg=model)
2025-11-25 10:40:02 WRN Failed to exchange Hello messages (device=FAG3LS3 address=192.168.5.244:22000 error="Application error 0x0 (remote): closing" log.pkg=connections)
2025-11-25 10:40:32 WRN Failed to exchange Hello messages (device=FAG3LS3 address=192.168.5.244:22000 error="Application error 0x0 (remote): closing" log.pkg=connections)
2025-11-25 10:40:52 INF Established secure connection (device=FAG3LS3 connection.local=192.168.5.249:22000 connection.remote=192.168.5.244:22000 connection.type=tcp-client connection.lan=true connection.crypto=TLS1.3-TLS_AES_128_GCM_SHA256 connection.prio=10 connection.id=63R3UG49M76D84QR0N68JG0EHU log.pkg=connections)
2025-11-25 10:40:52 INF New device connection (device=FAG3LS3 address=192.168.5.244:22000 remote.name="" remote.client=syncthing remote.version=v2.0.10 log.pkg=model)
2025-11-25 10:40:53 INF Lost device connection (kind=primary device=FAG3LS3 connection=192.168.5.249:22000-192.168.5.244:22000/tcp-client/TLS1.3-TLS_AES_128_GCM_SHA256/LAN-P10-63R3UG49M76D84QR0N68JG0EHU error="reading length: read tcp 192.168.5.249:22000->192.168.5.244:22000: wsarecv: An existing connection was forcibly closed by the remote host." remaining=0 log.pkg=model)
2025-11-25 10:40:53 INF Connection closed (device=FAG3LS3 connection=192.168.5.249:22000-192.168.5.244:22000/tcp-client/TLS1.3-TLS_AES_128_GCM_SHA256/LAN-P10-63R3UG49M76D84QR0N68JG0EHU error="reading length: read tcp 192.168.5.249:22000->192.168.5.244:22000: wsarecv: An existing connection was forcibly closed by the remote host." log.pkg=model)
2025-11-25 10:41:13 INF Established secure connection (device=FAG3LS3 connection.local="[::]:22000" connection.remote=192.168.5.244:22000 connection.type=quic-client connection.lan=true connection.crypto=TLS1.3-TLS_AES_128_GCM_SHA256 connection.prio=20 connection.id=63R3UIK7RG5QQJ1SL017NTKQ3I log.pkg=connections)
2025-11-25 10:41:13 INF New device connection (device=FAG3LS3 address=192.168.5.244:22000 remote.name="" remote.client=syncthing remote.version=v2.0.10 log.pkg=model)
2025-11-25 10:41:14 INF Lost device connection (kind=primary device=FAG3LS3 connection="[::]:22000-192.168.5.244:22000/quic-client/TLS1.3-TLS_AES_128_GCM_SHA256/LAN-P20-63R3UIK7RG5QQJ1SL017NTKQ3I" error="reading length: Application error 0x0 (remote): closing" remaining=0 log.pkg=model)
2025-11-25 10:41:14 INF Connection closed (device=FAG3LS3 connection="[::]:22000-192.168.5.244:22000/quic-client/TLS1.3-TLS_AES_128_GCM_SHA256/LAN-P20-63R3UIK7RG5QQJ1SL017NTKQ3I" error="reading length: Application error 0x0 (remote): closing" log.pkg=model)
2025-11-25 10:41:23 INF Established secure connection (device=FAG3LS3 connection.local=192.168.5.249:22000 connection.remote=192.168.5.244:22000 connection.type=tcp-client connection.lan=true connection.crypto=TLS1.3-TLS_AES_128_GCM_SHA256 connection.prio=10 connection.id=63R3UJPSL72N29O3BUANU8C690 log.pkg=connections)
2025-11-25 10:41:23 INF New device connection (device=FAG3LS3 address=192.168.5.244:22000 remote.name="" remote.client=syncthing remote.version=v2.0.10 log.pkg=model)
2025-11-25 10:41:24 INF Lost device connection (kind=primary device=FAG3LS3 connection=192.168.5.249:22000-192.168.5.244:22000/tcp-client/TLS1.3-TLS_AES_128_GCM_SHA256/LAN-P10-63R3UJPSL72N29O3BUANU8C690 error="reading length: read tcp 192.168.5.249:22000->192.168.5.244:22000: wsarecv: An existing connection was forcibly closed by the remote host." remaining=0 log.pkg=model)
2025-11-25 10:41:24 INF Connection closed (device=FAG3LS3 connection=192.168.5.249:22000-192.168.5.244:22000/tcp-client/TLS1.3-TLS_AES_128_GCM_SHA256/LAN-P10-63R3UJPSL72N29O3BUANU8C690 error="reading length: read tcp 192.168.5.249:22000->192.168.5.244:22000: wsarecv: An existing connection was forcibly closed by the remote host." log.pkg=model)
2025-11-25 10:41:24 INF Established secure connection (device=FAG3LS3 connection.local=192.168.5.249:22000 connection.remote=192.168.5.244:22000 connection.type=tcp-client connection.lan=true connection.crypto=TLS1.3-TLS_AES_128_GCM_SHA256 connection.prio=10 connection.id=63R3UJUE0K8LGR2G9C2IADEGCG log.pkg=connections)
2025-11-25 10:41:24 INF New device connection (device=FAG3LS3 address=192.168.5.244:22000 remote.name="" remote.client=syncthing remote.version=v2.0.10 log.pkg=model)
2025-11-25 10:41:25 INF Lost device connection (kind=primary device=FAG3LS3 connection=192.168.5.249:22000-192.168.5.244:22000/tcp-client/TLS1.3-TLS_AES_128_GCM_SHA256/LAN-P10-63R3UJUE0K8LGR2G9C2IADEGCG error="reading length: read tcp 192.168.5.249:22000->192.168.5.244:22000: wsarecv: An existing connection was forcibly closed by the remote host." remaining=0 log.pkg=model)
2025-11-25 10:41:25 INF Connection closed (device=FAG3LS3 connection=192.168.5.249:22000-192.168.5.244:22000/tcp-client/TLS1.3-TLS_AES_128_GCM_SHA256/LAN-P10-63R3UJUE0K8LGR2G9C2IADEGCG error="reading length: read tcp 192.168.5.249:22000->192.168.5.244:22000: wsarecv: An existing connection was forcibly closed by the remote host." log.pkg=model)
2025-11-25 10:41:26 INF Established secure connection (device=FAG3LS3 connection.local=192.168.5.249:22000 connection.remote=192.168.5.244:22000 connection.type=tcp-client connection.lan=true connection.crypto=TLS1.3-TLS_AES_128_GCM_SHA256 connection.prio=10 connection.id=63R3UK2USC6C46L2LMJQLDR7B2 log.pkg=connections)
2025-11-25 10:41:26 INF New device connection (device=FAG3LS3 address=192.168.5.244:22000 remote.name="" remote.client=syncthing remote.version=v2.0.10 log.pkg=model)
2025-11-25 10:41:27 INF Lost device connection (kind=primary device=FAG3LS3 connection=192.168.5.249:22000-192.168.5.244:22000/tcp-client/TLS1.3-TLS_AES_128_GCM_SHA256/LAN-P10-63R3UK2USC6C46L2LMJQLDR7B2 error="reading length: read tcp 192.168.5.249:22000->192.168.5.244:22000: wsarecv: An existing connection was forcibly closed by the remote host." remaining=0 log.pkg=model)
2025-11-25 10:41:27 INF Connection closed (device=FAG3LS3 connection=192.168.5.249:22000-192.168.5.244:22000/tcp-client/TLS1.3-TLS_AES_128_GCM_SHA256/LAN-P10-63R3UK2USC6C46L2LMJQLDR7B2 error="reading length: read tcp 192.168.5.249:22000->192.168.5.244:22000: wsarecv: An existing connection was forcibly closed by the remote host." log.pkg=model)
2025-11-25 10:41:27 INF Established secure connection (device=FAG3LS3 connection.local=192.168.5.249:22000 connection.remote=192.168.5.244:22000 connection.type=tcp-client connection.lan=true connection.crypto=TLS1.3-TLS_AES_128_GCM_SHA256 connection.prio=10 connection.id=63R3UK7GLCILUGCO6ALFF7ASRQ log.pkg=connections)
2025-11-25 10:41:27 INF New device connection (device=FAG3LS3 address=192.168.5.244:22000 remote.name="" remote.client=syncthing remote.version=v2.0.10 log.pkg=model)
2025-11-25 10:41:28 INF Lost device connection (kind=primary device=FAG3LS3 connection=192.168.5.249:22000-192.168.5.244:22000/tcp-client/TLS1.3-TLS_AES_128_GCM_SHA256/LAN-P10-63R3UK7GLCILUGCO6ALFF7ASRQ error="reading length: read tcp 192.168.5.249:22000->192.168.5.244:22000: wsarecv: An existing connection was forcibly closed by the remote host." remaining=0 log.pkg=model)
2025-11-25 10:41:28 INF Connection closed (device=FAG3LS3 connection=192.168.5.249:22000-192.168.5.244:22000/tcp-client/TLS1.3-TLS_AES_128_GCM_SHA256/LAN-P10-63R3UK7GLCILUGCO6ALFF7ASRQ error="reading length: read tcp 192.168.5.249:22000->192.168.5.244:22000: wsarecv: An existing connection was forcibly closed by the remote host." log.pkg=model)
2025-11-25 10:41:57 INF Established secure connection (device=FAG3LS3 connection.local="[::]:22000" connection.remote=192.168.5.244:22000 connection.type=quic-client connection.lan=true connection.crypto=TLS1.3-TLS_AES_128_GCM_SHA256 connection.prio=20 connection.id=63R3UNNLS4DEEMLUB5G16UP1BK log.pkg=connections)
2025-11-25 10:41:57 INF New device connection (device=FAG3LS3 address=192.168.5.244:22000 remote.name="" remote.client=syncthing remote.version=v2.0.10 log.pkg=model)
2025-11-25 10:41:58 INF Lost device connection (kind=primary device=FAG3LS3 connection="[::]:22000-192.168.5.244:22000/quic-client/TLS1.3-TLS_AES_128_GCM_SHA256/LAN-P20-63R3UNNLS4DEEMLUB5G16UP1BK" error="reading length: Application error 0x0 (remote): closing" remaining=0 log.pkg=model)
2025-11-25 10:41:58 INF Connection closed (device=FAG3LS3 connection="[::]:22000-192.168.5.244:22000/quic-client/TLS1.3-TLS_AES_128_GCM_SHA256/LAN-P20-63R3UNNLS4DEEMLUB5G16UP1BK" error="reading length: Application error 0x0 (remote): closing" log.pkg=model)
2025-11-25 10:42:27 INF Established secure connection (device=FAG3LS3 connection.local=192.168.5.249:22000 connection.remote=192.168.5.244:22000 connection.type=tcp-client connection.lan=true connection.crypto=TLS1.3-TLS_AES_128_GCM_SHA256 connection.prio=10 connection.id=63R3UR879F3OEH035HJOCPD3JC log.pkg=connections)
2025-11-25 10:42:27 INF New device connection (device=FAG3LS3 address=192.168.5.244:22000 remote.name="" remote.client=syncthing remote.version=v2.0.10 log.pkg=model)
2025-11-25 10:42:28 INF Lost device connection (kind=primary device=FAG3LS3 connection=192.168.5.249:22000-192.168.5.244:22000/tcp-client/TLS1.3-TLS_AES_128_GCM_SHA256/LAN-P10-63R3UR879F3OEH035HJOCPD3JC error="reading length: read tcp 192.168.5.249:22000->192.168.5.244:22000: wsarecv: An existing connection was forcibly closed by the remote host." remaining=0 log.pkg=model)
2025-11-25 10:42:28 INF Connection closed (device=FAG3LS3 connection=192.168.5.249:22000-192.168.5.244:22000/tcp-client/TLS1.3-TLS_AES_128_GCM_SHA256/LAN-P10-63R3UR879F3OEH035HJOCPD3JC error="reading length: read tcp 192.168.5.249:22000->192.168.5.244:22000: wsarecv: An existing connection was forcibly closed by the remote host." log.pkg=model)
2025-11-25 10:42:37 INF Resolved external address (uri=quic://0.0.0.0:22000 address=quic://112.64.75.77:16818 via=stun.internetcalls.com:3478 log.pkg=connections)
2025-11-25 10:42:47 WRN Failed to exchange Hello messages (device=FAG3LS3 address=192.168.5.244:22000 error="Application error 0x0 (remote): closing" log.pkg=connections)
2025-11-25 10:43:32 INF Established secure connection (device=FAG3LS3 connection.local=192.168.5.249:22000 connection.remote=192.168.5.244:22000 connection.type=tcp-client connection.lan=true connection.crypto=TLS1.3-TLS_AES_128_GCM_SHA256 connection.prio=10 connection.id=63R3V2Q1L7AJM2IMK0H0VM60IM log.pkg=connections)
2025-11-25 10:43:32 INF New device connection (device=FAG3LS3 address=192.168.5.244:22000 remote.name="" remote.client=syncthing remote.version=v2.0.10 log.pkg=model)
2025-11-25 10:43:33 INF Lost device connection (kind=primary device=FAG3LS3 connection=192.168.5.249:22000-192.168.5.244:22000/tcp-client/TLS1.3-TLS_AES_128_GCM_SHA256/LAN-P10-63R3V2Q1L7AJM2IMK0H0VM60IM error="reading length: read tcp 192.168.5.249:22000->192.168.5.244:22000: wsarecv: An existing connection was forcibly closed by the remote host." remaining=0 log.pkg=model)
2025-11-25 10:43:33 INF Connection closed (device=FAG3LS3 connection=192.168.5.249:22000-192.168.5.244:22000/tcp-client/TLS1.3-TLS_AES_128_GCM_SHA256/LAN-P10-63R3V2Q1L7AJM2IMK0H0VM60IM error="reading length: read tcp 192.168.5.249:22000->192.168.5.244:22000: wsarecv: An existing connection was forcibly closed by the remote host." log.pkg=model)
2025-11-25 10:43:52 WRN Failed to exchange Hello messages (device=FAG3LS3 address=192.168.5.244:22000 error="Application error 0x0 (remote): closing" log.pkg=connections)
2025-11-25 10:44:17 INF Established secure connection (device=FAG3LS3 connection.local="[::]:22000" connection.remote=192.168.5.244:22000 connection.type=quic-client connection.lan=true connection.crypto=TLS1.3-TLS_AES_128_GCM_SHA256 connection.prio=20 connection.id=63R3V828R4IC4LTGKRFI2KN17E log.pkg=connections)
2025-11-25 10:44:17 INF New device connection (device=FAG3LS3 address=192.168.5.244:22000 remote.name="" remote.client=syncthing remote.version=v2.0.10 log.pkg=model)
2025-11-25 10:44:18 INF Lost device connection (kind=primary device=FAG3LS3 connection="[::]:22000-192.168.5.244:22000/quic-client/TLS1.3-TLS_AES_128_GCM_SHA256/LAN-P20-63R3V828R4IC4LTGKRFI2KN17E" error="reading length: Application error 0x0 (remote): closing" remaining=0 log.pkg=model)
2025-11-25 10:44:18 INF Connection closed (device=FAG3LS3 connection="[::]:22000-192.168.5.244:22000/quic-client/TLS1.3-TLS_AES_128_GCM_SHA256/LAN-P20-63R3V828R4IC4LTGKRFI2KN17E" error="reading length: Application error 0x0 (remote): closing" log.pkg=model)
2025-11-25 10:46:19 INF Established secure connection (device=FAG3LS3 connection.local=192.168.5.249:22000 connection.remote=192.168.5.244:22000 connection.type=tcp-client connection.lan=true connection.crypto=TLS1.3-TLS_AES_128_GCM_SHA256 connection.prio=10 connection.id=63R3VM72PP46MJDGCE73OJIKCI log.pkg=connections)
2025-11-25 10:46:19 INF New device connection (device=FAG3LS3 address=192.168.5.244:22000 remote.name="" remote.client=syncthing remote.version=v2.0.10 log.pkg=model)
2025-11-25 10:46:20 INF Lost device connection (kind=primary device=FAG3LS3 connection=192.168.5.249:22000-192.168.5.244:22000/tcp-client/TLS1.3-TLS_AES_128_GCM_SHA256/LAN-P10-63R3VM72PP46MJDGCE73OJIKCI error="reading length: read tcp 192.168.5.249:22000->192.168.5.244:22000: wsarecv: An existing connection was forcibly closed by the remote host." remaining=0 log.pkg=model)
2025-11-25 10:46:20 INF Connection closed (device=FAG3LS3 connection=192.168.5.249:22000-192.168.5.244:22000/tcp-client/TLS1.3-TLS_AES_128_GCM_SHA256/LAN-P10-63R3VM72PP46MJDGCE73OJIKCI error="reading length: read tcp 192.168.5.249:22000->192.168.5.244:22000: wsarecv: An existing connection was forcibly closed by the remote host." log.pkg=model)
2025-11-25 10:48:07 INF QUIC listener shutting down (address="[::]:22000" log.pkg=connections)
2025-11-25 10:48:07 INF Relay listener shutting down (id=dynamic+https://relays.syncthing.net/endpoint log.pkg=connections)
2025-11-25 10:48:07 INF Lost device connection (kind=secondary device=SQNQS2I connection=192.168.5.249:22000-192.168.5.187:63763/tcp-server/TLS1.3-TLS_AES_128_GCM_SHA256/LAN-P10-63R3TDPH6A28OEN9L4B3J75964 error="Syncthing is being stopped" remaining=2 log.pkg=model)
2025-11-25 10:48:07 INF Lost device connection (kind=secondary device=SQNQS2I connection=192.168.5.249:22000-192.168.5.187:63946/tcp-server/TLS1.3-TLS_AES_128_GCM_SHA256/LAN-P10-63R3TKOQ9T94O881MNR7TSRU04 error="Syncthing is being stopped" remaining=1 log.pkg=model)
2025-11-25 10:48:07 INF Lost device connection (kind=primary device=SQNQS2I connection=192.168.5.249:22000-192.168.5.187:22000/tcp-server/TLS1.3-TLS_AES_128_GCM_SHA256/LAN-P10-63R3TDP4141089BCRBEG7CVA00 error="Syncthing is being stopped" remaining=0 log.pkg=model)
2025-11-25 10:48:07 INF Connection closed (device=SQNQS2I connection=192.168.5.249:22000-192.168.5.187:22000/tcp-server/TLS1.3-TLS_AES_128_GCM_SHA256/LAN-P10-63R3TDP4141089BCRBEG7CVA00 error="Syncthing is being stopped" log.pkg=model)
2025-11-25 10:48:08 INF TCP listener shutting down (address="[::]:22000" log.pkg=connections)
2025-11-25 10:48:08 INF Exiting (log.pkg=syncthing)
2025-11-25 10:48:08 INF Saved log output (path=C:\Users\swq\AppData\Local\Syncthing\syncthing.log log.pkg=main)
2025-11-25 10:48:08 INF syncthing v2.0.11 "Hafnium Hornet" (go1.25.3 windows-amd64) builder@github.syncthing.net 2025-10-27 03:59:48 UTC (log.pkg=main)
2025-11-25 10:48:09 INF Calculated our device ID (device=Q5XVXSC log.pkg=syncthing)
2025-11-25 10:48:09 INF Overall rate limit in use (send="is unlimited" recv="is unlimited" log.pkg=connections)
2025-11-25 10:48:09 INF Relay listener starting (id=dynamic+https://relays.syncthing.net/endpoint log.pkg=connections)
2025-11-25 10:48:09 INF Using discovery mechanism (identity="global discovery server https://discovery-lookup.syncthing.net/v2/?noannounce" log.pkg=discover)
2025-11-25 10:48:09 INF Using discovery mechanism (identity="global discovery server https://discovery-announce-v4.syncthing.net/v2/?nolookup" log.pkg=discover)
2025-11-25 10:48:09 INF Using discovery mechanism (identity="global discovery server https://discovery-announce-v6.syncthing.net/v2/?nolookup" log.pkg=discover)
2025-11-25 10:48:09 INF Using discovery mechanism (identity="IPv4 local broadcast discovery on port 21027" log.pkg=discover)
2025-11-25 10:48:09 INF Using discovery mechanism (identity="IPv6 local multicast discovery on address [ff12::8384]:21027" log.pkg=discover)
2025-11-25 10:48:09 INF GUI and API listening (address=127.0.0.1:8384 log.pkg=api)
2025-11-25 10:48:09 INF Access the GUI via the following URL: http://127.0.0.1:8384/ (log.pkg=api)
2025-11-25 10:48:09 INF Loaded configuration (name=DESKTOP-8NM546Q log.pkg=syncthing)
2025-11-25 10:48:09 INF Loaded peer device configuration (device=FAG3LS3 name=Magic7Pro address="[dynamic]" log.pkg=syncthing)
2025-11-25 10:48:09 INF Loaded peer device configuration (device=SQNQS2I name=LAPTOP-RGURVASI address="[dynamic]" log.pkg=syncthing)
2025-11-25 10:48:09 INF Loaded peer device configuration (device=UJVCEEF name="GT Pro" address="[dynamic]" log.pkg=syncthing)
2025-11-25 10:48:09 INF Ready to synchronize (folder.label=Saunak_library folder.id=u6sxp-3t5pf folder.type=sendonly log.pkg=model)
2025-11-25 10:48:09 INF QUIC listener starting (address="[::]:22000" log.pkg=connections)
2025-11-25 10:48:09 INF TCP listener starting (address="[::]:22000" log.pkg=connections)
2025-11-25 10:48:09 INF Established secure connection (device=SQNQS2I connection.local=192.168.5.249:22000 connection.remote=192.168.5.187:22000 connection.type=tcp-server connection.lan=true connection.crypto=TLS1.3-TLS_AES_128_GCM_SHA256 connection.prio=10 connection.id=63R402VV0I398DPF3I6H0B07QU log.pkg=connections)
2025-11-25 10:48:09 INF New device connection (device=SQNQS2I address=192.168.5.187:22000 remote.name=LAPTOP-RGURVASI remote.client=syncthing remote.version=v2.0.11 log.pkg=model)
2025-11-25 10:48:09 INF Established secure connection (device=SQNQS2I connection.local=192.168.5.249:22000 connection.remote=192.168.5.187:49398 connection.type=tcp-server connection.lan=true connection.crypto=TLS1.3-TLS_AES_128_GCM_SHA256 connection.prio=10 connection.id=63R4030CCL388BVSGD6HT11AT6 log.pkg=connections)
2025-11-25 10:48:09 INF Additional device connection (device=SQNQS2I address=192.168.5.187:49398 count=1 log.pkg=model)
2025-11-25 10:48:09 INF Measured hashing performance (perf="2522.89 MB/s" log.pkg=syncthing)
2025-11-25 10:48:10 INF Completed initial scan (folder.label=Saunak_library folder.id=u6sxp-3t5pf folder.type=sendonly log.pkg=model)
2025-11-25 10:48:29 INF Detected NAT services (count=0 log.pkg=nat)
2025-11-25 10:48:46 INF Joined relay (uri=relay://101.132.255.222:22067 log.pkg=relay/client)
2025-11-25 10:48:47 INF Detected NAT type (uri=quic://0.0.0.0:22000 type="Port restricted NAT" log.pkg=connections)
2025-11-25 10:48:47 INF Resolved external address (uri=quic://0.0.0.0:22000 address=quic://112.64.75.77:16818 via=stun.voip.aebc.com:3478 log.pkg=connections)
2025-11-25 10:49:09 INF Established secure connection (device=SQNQS2I connection.local=192.168.5.249:22000 connection.remote=192.168.5.187:49480 connection.type=tcp-server connection.lan=true connection.crypto=TLS1.3-TLS_AES_128_GCM_SHA256 connection.prio=10 connection.id=63R409VRHJMDGJVUC9P8G9ICMG log.pkg=connections)
2025-11-25 10:49:09 INF Additional device connection (device=SQNQS2I address=192.168.5.187:49480 count=2 log.pkg=model)
2025-11-25 10:49:23 INF Established secure connection (device=FAG3LS3 connection.local=192.168.5.249:22000 connection.remote=192.168.5.244:22000 connection.type=tcp-client connection.lan=true connection.crypto=TLS1.3-TLS_AES_128_GCM_SHA256 connection.prio=10 connection.id=63R40BMA7ROB6NQIEC2MLEKG08 log.pkg=connections)
2025-11-25 10:49:23 INF New device connection (device=FAG3LS3 address=192.168.5.244:22000 remote.name="" remote.client=syncthing remote.version=v2.0.10 log.pkg=model)
2025-11-25 10:49:24 INF Lost device connection (kind=primary device=FAG3LS3 connection=192.168.5.249:22000-192.168.5.244:22000/tcp-client/TLS1.3-TLS_AES_128_GCM_SHA256/LAN-P10-63R40BMA7ROB6NQIEC2MLEKG08 error="reading length: read tcp 192.168.5.249:22000->192.168.5.244:22000: wsarecv: An existing connection was forcibly closed by the remote host." remaining=0 log.pkg=model)
2025-11-25 10:49:24 INF Connection closed (device=FAG3LS3 connection=192.168.5.249:22000-192.168.5.244:22000/tcp-client/TLS1.3-TLS_AES_128_GCM_SHA256/LAN-P10-63R40BMA7ROB6NQIEC2MLEKG08 error="reading length: read tcp 192.168.5.249:22000->192.168.5.244:22000: wsarecv: An existing connection was forcibly closed by the remote host." log.pkg=model)
2025-11-25 10:49:55 INF Established secure connection (device=FAG3LS3 connection.local=192.168.5.249:22000 connection.remote=192.168.5.244:22000 connection.type=tcp-client connection.lan=true connection.crypto=TLS1.3-TLS_AES_128_GCM_SHA256 connection.prio=10 connection.id=63R40FCRTUHTQPQC08ASHNCITQ log.pkg=connections)
2025-11-25 10:49:55 INF New device connection (device=FAG3LS3 address=192.168.5.244:22000 remote.name="" remote.client=syncthing remote.version=v2.0.10 log.pkg=model)
2025-11-25 10:49:56 INF Lost device connection (kind=primary device=FAG3LS3 connection=192.168.5.249:22000-192.168.5.244:22000/tcp-client/TLS1.3-TLS_AES_128_GCM_SHA256/LAN-P10-63R40FCRTUHTQPQC08ASHNCITQ error="reading length: read tcp 192.168.5.249:22000->192.168.5.244:22000: wsarecv: An existing connection was forcibly closed by the remote host." remaining=0 log.pkg=model)
2025-11-25 10:49:56 INF Connection closed (device=FAG3LS3 connection=192.168.5.249:22000-192.168.5.244:22000/tcp-client/TLS1.3-TLS_AES_128_GCM_SHA256/LAN-P10-63R40FCRTUHTQPQC08ASHNCITQ error="reading length: read tcp 192.168.5.249:22000->192.168.5.244:22000: wsarecv: An existing connection was forcibly closed by the remote host." log.pkg=model)
2025-11-25 10:53:57 WRN Failed to exchange Hello messages (device=UJVCEEF address=192.168.5.87:22000 error="Application error 0x0 (remote): closing" log.pkg=connections)
2025-11-25 10:54:28 INF Established secure connection (device=UJVCEEF connection.local=192.168.5.249:22000 connection.remote=192.168.5.87:22000 connection.type=tcp-client connection.lan=true connection.crypto=TLS1.3-TLS_AES_128_GCM_SHA256 connection.prio=10 connection.id=63R41F74GLV5C27US2BEL2H454 log.pkg=connections)
2025-11-25 10:54:28 INF New device connection (device=UJVCEEF address=192.168.5.87:22000 remote.name="" remote.client=syncthing remote.version=v2.0.10 log.pkg=model)
2025-11-25 10:54:29 INF Lost device connection (kind=primary device=UJVCEEF connection=192.168.5.249:22000-192.168.5.87:22000/tcp-client/TLS1.3-TLS_AES_128_GCM_SHA256/LAN-P10-63R41F74GLV5C27US2BEL2H454 error="reading length: read tcp 192.168.5.249:22000->192.168.5.87:22000: wsarecv: An existing connection was forcibly closed by the remote host." remaining=0 log.pkg=model)
2025-11-25 10:54:29 INF Connection closed (device=UJVCEEF connection=192.168.5.249:22000-192.168.5.87:22000/tcp-client/TLS1.3-TLS_AES_128_GCM_SHA256/LAN-P10-63R41F74GLV5C27US2BEL2H454 error="reading length: read tcp 192.168.5.249:22000->192.168.5.87:22000: wsarecv: An existing connection was forcibly closed by the remote host." log.pkg=model)

Android log (logcat)

[DeanLemans]

Confirmed. On windows 10 enterprise and pixel 9 XL pro with grephene OS.

But for me it sometimes works when i restart both

[researchxxl]

I dont think this is app related because the app is just a wrapper for the syncthing executable provided by github.com/syncthing/syncthing maybe the community can help trouble shoot the issue

[febryanvaldo]

This is just a wrapper, so if something gone wrong, there should be an error within the main app itself, or your config or how do you set your syncthing up? No?

[DeanLemans]

No errors