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https://issues.apache.org/jira/browse/GUACAMOLE-967?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17042589#comment-17042589
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Nick Couchman commented on GUACAMOLE-967:
-----------------------------------------
I suspect that you might be running into the same issue that has been reported
by others with the WDDM driver requirement in later versions of Windows. If
you look on the mailing list archives and at the JIRA issues already entered
you may find others who have run into the same issue, and some suggested
work-arounds until we're able to figure out what needs to be done to get
Guacamole to connect correctly to systems that have WDDM enabled.
> Cannot connect with RDP to QEMU VM running on same host with other ip address
> -----------------------------------------------------------------------------
>
> Key: GUACAMOLE-967
> URL: https://issues.apache.org/jira/browse/GUACAMOLE-967
> Project: Guacamole
> Issue Type: Bug
> Components: guacamole
> Affects Versions: 1.0.0, 1.1.0
> Environment: Debian 10.1 x64, Tomcat9, nginx reverseproxy
> Reporter: Sebastian Ruff
> Priority: Minor
> Attachments: 2020-02-22
> [email protected]_WinServ19.png
>
>
> I had this issue since I started using Guacamole (v1.0).
> I cannot connect to my Win Server 2019 VM wich is running on the same host
> but with another public IP Adress and vituell MAC Adress.
> I never really cared that uch abut the issue, because I found an workaround,
> running a localhost qemu vnc server for that VM. But I want to get the issue
> fixed so don't have to do that for every VM.
> I thought after upgrading to 1.1 so to FreeRDP 2.0, I could be fixed, but
> that isn't the case.
> But I have to say I can connect to the rdp session with any other software
> tool running on the host machine.
> I attached an Screenshot where you can see the Error Message of the
> Guacamole client.
> {{syslog:}}
> {{}}
> {color:#cccccc}Feb 22 15:02:27 main-misterbit-debian101-x64 tomcat9[10806]:
> 15:02:27.703 [http-nio-127.0.0.1-8080-exec-13] INFO
> o.a.g.tunnel.TunnelRequestService - User "misterbit" connected to conne$
> Feb 22 15:02:27 main-misterbit-debian101-x64 guacd[15656]: User
> "@39fd665c-77a7-4df9-8535-01418413a889" joined connection
> "$4d7d62b5-0e34-4a3b-920d-e4dc10bbde65" (1 users now present)
> Feb 22 15:02:27 main-misterbit-debian101-x64 guacd[15656]: Loading keymap
> "base"
> Feb 22 15:02:27 main-misterbit-debian101-x64 guacd[15656]: Loading keymap
> "en-us-qwerty"
> Feb 22 15:02:27 main-misterbit-debian101-x64 guacd[15656]: Certificate
> validation failed
> Feb 22 15:02:27 main-misterbit-debian101-x64 guacd[15656]: Error connecting
> to RDP server
> Feb 22 15:02:27 main-misterbit-debian101-x64 guacd[15656]: User
> "@39fd665c-77a7-4df9-8535-01418413a889" disconnected (0 users remain)
> Feb 22 15:02:27 main-misterbit-debian101-x64 guacd[15656]: Last user of
> connection "$4d7d62b5-0e34-4a3b-920d-e4dc10bbde65" disconnected
> Feb 22 15:02:27 main-misterbit-debian101-x64 tomcat9[10806]: Exception in
> thread "Thread-22" 15:02:27.773 [http-nio-127.0.0.1-8080-exec-18] INFO
> o.a.g.tunnel.TunnelRequestService - Use$
> Feb 22 15:02:27 main-misterbit-debian101-x64 tomcat9[10806]:
> java.lang.IllegalStateException: Message will not be sent because the
> WebSocket session has been closed
> Feb 22 15:02:27 main-misterbit-debian101-x64 tomcat9[10806]:{color}
> {color:#cccccc}at
> org.apache.tomcat.websocket.WsRemoteEndpointImplBase.writeMessagePart(WsRemoteEndpointImplBase.java:425)
> Feb 22 15:02:27 main-misterbit-debian101-x64 tomcat9[10806]:{color}
> {color:#cccccc}at
> org.apache.tomcat.websocket.WsRemoteEndpointImplBase.sendMessageBlock(WsRemoteEndpointImplBase.java:309)
> Feb 22 15:02:27 main-misterbit-debian101-x64 tomcat9[10806]:{color}
> {color:#cccccc}at
> org.apache.tomcat.websocket.WsRemoteEndpointImplBase.sendMessageBlock(WsRemoteEndpointImplBase.java:250)
> Feb 22 15:02:27 main-misterbit-debian101-x64 tomcat9[10806]:{color}
> {color:#cccccc}at
> org.apache.tomcat.websocket.WsRemoteEndpointImplBase.sendString(WsRemoteEndpointImplBase.java:191)
> Feb 22 15:02:27 main-misterbit-debian101-x64 tomcat9[10806]:{color}
> {color:#cccccc}at
> org.apache.tomcat.websocket.WsRemoteEndpointBasic.sendText(WsRemoteEndpointBasic.java:37)
> Feb 22 15:02:27 main-misterbit-debian101-x64 tomcat9[10806]:{color}
> {color:#cccccc}at
> org.apache.guacamole.websocket.GuacamoleWebSocketTunnelEndpoint.sendInstruction(GuacamoleWebSocketTunnelEndpoint.java:$
> Feb 22 15:02:27 main-misterbit-debian101-x64 tomcat9[10806]:{color}
> {color:#cccccc}at
> org.apache.guacamole.websocket.GuacamoleWebSocketTunnelEndpoint.access$200(GuacamoleWebSocketTunnelEndpoint.java:53)
>
> Feb 22 15:02:27 main-misterbit-debian101-x64 tomcat9[10806]:{color}
> {color:#cccccc}at
> org.apache.guacamole.websocket.GuacamoleWebSocketTunnelEndpoint$2.run(GuacamoleWebSocketTunnelEndpoint.java:253)
>
> Feb 22 15:02:27 main-misterbit-debian101-x64 guacd[11449]: Connection
> "$4d7d62b5-0e34-4a3b-920d-e4dc10bbde65" removed.{color}
> \{{}}
>
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