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https://issues.apache.org/jira/browse/GUACAMOLE-238?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15898474#comment-15898474
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Michael Jumper commented on GUACAMOLE-238:
------------------------------------------
If the RDP server is trying to use TLS, you may also need to ignore the
certificate (as it will be self-signed).
> RDP Not Working on Server 2016 without Credentials
> --------------------------------------------------
>
> Key: GUACAMOLE-238
> URL: https://issues.apache.org/jira/browse/GUACAMOLE-238
> Project: Guacamole
> Issue Type: Bug
> Components: guacamole, guacamole-auth-jdbc-mysql, guacamole-auth-ldap
> Affects Versions: 0.9.9, 0.9.10-incubating, 0.9.11-incubating
> Environment: Debian 8.3, Nginx reverse proxy, public SSL
> Reporter: Jesse Brinson
> Priority: Minor
>
> RDP fails immediately on Server 2016 when no username/password are specified
> in authentication parameters. When I manually set username/password, it will
> connect.
> Domain, hostname, RDP Encryption and port number are the only other
> set-parameters. (also tried using different auth types). Server 2012 R2 and
> back work ok with these variables, and credentials left blank.
> I've tried updating freerdp to the nightly version, and using Java 7 and 8,
> still no success.
> Logs are only showing non-descriptive errors:
> catalina.out:
> {noformat}
> 17:08:03.734 [http-nio-8080-exec-23] INFO o.a.g.tunnel.TunnelRequestService
> - User "guacadmin" connected to connection "18".
> 17:08:03.858 [Thread-341] INFO o.a.g.tunnel.TunnelRequestService - User
> "guacadmin" disconnected from connection "18". Duration: 124 milliseconds
> 17:08:08.718 [http-nio-8080-exec-23] INFO o.a.g.tunnel.TunnelRequestService
> - User "guacadmin" connected to connection "18".
> Exception in thread "Thread-344" 17:08:08.761 [http-nio-8080-exec-28] INFO
> o.a.g.tunnel.TunnelRequestService - User "guacadmin" disconnected from
> connection "18". Duration: 42 milliseconds
> java.lang.IllegalStateException: Message will not be sent because the
> WebSocket session has been closed
> at
> org.apache.tomcat.websocket.WsRemoteEndpointImplBase.writeMessagePart(WsRemoteEndpointImplBase.java:354)
> at
> org.apache.tomcat.websocket.WsRemoteEndpointImplBase.startMessage(WsRemoteEndpointImplBase.java:311)
> at
> org.apache.tomcat.websocket.WsRemoteEndpointImplBase$TextMessageSendHandler.write(WsRemoteEndpointImplBase.java:675)
> at
> org.apache.tomcat.websocket.WsRemoteEndpointImplBase.sendPartialString(WsRemoteEndpointImplBase.java:220)
> at
> org.apache.tomcat.websocket.WsRemoteEndpointImplBase.sendString(WsRemoteEndpointImplBase.java:172)
> at
> org.apache.tomcat.websocket.WsRemoteEndpointBasic.sendText(WsRemoteEndpointBasic.java:37)
> at
> org.apache.guacamole.websocket.GuacamoleWebSocketTunnelEndpoint$2.run(GuacamoleWebSocketTunnelEndpoint.java:169)
> {noformat}
> syslog:
> {noformat}
> Mar 6 17:08:35 guacremote guacd[989]: Creating new client for protocol "rdp"
> Mar 6 17:08:35 guacremote guacd[989]: Connection ID is
> "$4fe8d7cf-be40-4e3f-aa8b-d4006746a99c"
> Mar 6 17:08:35 guacremote guacd[9760]: Security mode: RDP
> Mar 6 17:08:35 guacremote guacd[9760]: Resize method: display-update
> Mar 6 17:08:35 guacremote guacd[9760]: User
> "@243c393c-899b-4cb8-a128-1f3b4671a15f" joined connection
> "$4fe8d7cf-be40-4e3f-aa8b-d4006746a99c" (1 users now present)
> Mar 6 17:08:35 guacremote guacd[9760]: Loading keymap "base"
> Mar 6 17:08:35 guacremote guacd[9760]: Loading keymap "en-us-qwerty"
> Mar 6 17:08:36 guacremote guacd[9760]: Error connecting to RDP server
> Mar 6 17:08:36 guacremote guacd[9760]: User
> "@243c393c-899b-4cb8-a128-1f3b4671a15f" disconnected (0 users remain)
> Mar 6 17:08:36 guacremote guacd[9760]: Last user of connection
> "$4fe8d7cf-be40-4e3f-aa8b-d4006746a99c" disconnected
> Mar 6 17:08:36 guacremote guacd[989]: Connection
> "$4fe8d7cf-be40-4e3f-aa8b-d4006746a99c" removed.
> {noformat}
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