diff --git a/ktmidi-ci-tool/src/commonMain/kotlin/dev/atsushieno/ktmidi/citool/MidiDeviceManager.kt b/ktmidi-ci-tool/src/commonMain/kotlin/dev/atsushieno/ktmidi/citool/MidiDeviceManager.kt
index 0250e0319..d2b8f6ecd 100644
--- a/ktmidi-ci-tool/src/commonMain/kotlin/dev/atsushieno/ktmidi/citool/MidiDeviceManager.kt
+++ b/ktmidi-ci-tool/src/commonMain/kotlin/dev/atsushieno/ktmidi/citool/MidiDeviceManager.kt
@@ -58,9 +58,11 @@ class MidiDeviceManager {
                 midiProtocol = MidiTransportProtocol.UMP,
             )
 
-            virtualMidiInput2 = midiAccessValue.createVirtualOutputReceiver(pcOut2)
-            midiInputOpened.forEach { it(virtualMidiInput2!!) }
-            virtualMidiOutput2 = midiAccessValue.createVirtualInputSender(pcIn2)
+            if (midiAccessValue.canCreateVirtualPort(pcIn2) && midiAccessValue.canCreateVirtualPort(pcOut2)) {
+                virtualMidiInput2 = midiAccessValue.createVirtualOutputReceiver(pcOut2)
+                midiInputOpened.forEach { it(virtualMidiInput2!!) }
+                virtualMidiOutput2 = midiAccessValue.createVirtualInputSender(pcIn2)
+            }
         } catch (ex: Exception) {
             println(ex)
             ex.printStackTrace()
diff --git a/ktmidi-ci-tool/src/desktopMain/kotlin/main.kt b/ktmidi-ci-tool/src/desktopMain/kotlin/main.kt
index 24de67fe9..7e830ad0f 100644
--- a/ktmidi-ci-tool/src/desktopMain/kotlin/main.kt
+++ b/ktmidi-ci-tool/src/desktopMain/kotlin/main.kt
@@ -12,19 +12,14 @@ import java.io.File
 fun main(args: Array<String>) = application {
     initializeAppModel(this)
     AppModel.midiDeviceManager.midiAccess =
-        /*
         if (File("/dev/snd/seq").exists()) AlsaMidiAccess()
         else if (args.contains("jvm")) JvmMidiAccess()
         else if (System.getProperty("os.name").contains("Windows")) JvmMidiAccess()
-        else RtMidiAccess() // rtmidi-javacpp does not support Windows build nowadays.
-         */
-        LibreMidiAccess.create(MidiTransportProtocol.MIDI1)
-        /*
-        MergedMidiAccess("LibreMidi1+2", listOf(
+        // else RtMidiAccess()
+        else MergedMidiAccess("LibreMidiAccess-1+2", listOf(
             LibreMidiAccess.create(MidiTransportProtocol.UMP),
             LibreMidiAccess.create(MidiTransportProtocol.MIDI1)
         ))
-         */
     Window(onCloseRequest = ::exitApplication,
         state = rememberWindowState(),
         title = "midi-ci-tool") {