Hi Team, I have been testing 1.6.0-RC1 with dockerized guacamole build.
guacamole/guacd:1.6.0-RC1 guacamole/guacamole:1.6.0-RC1 When I try to login to RDP terminal server from guacamole, I get the following error in logs guacamole-1 | 10:01:02.810 [http-nio-8080-exec-8] INFO o.a.g.tunnel.TunnelRequestService - User "administrator" connected to connection "1". guacd-1 | guacd[1]: INFO: Creating new client for protocol "rdp" guacd-1 | guacd[1]: INFO: Connection ID is "$bb241ab4-29aa-4ba5-8249-60f0255682eb" guacd-1 | guacd[439]: INFO: Security mode: Negotiate (ANY) guacd-1 | guacd[439]: INFO: Resize method: display-update guacd-1 | guacd[439]: INFO: No clipboard line-ending normalization specified. Defaulting to preserving the format of all line endings. guacd-1 | guacd[439]: INFO: User "@60fe8d0f-411b-4b09-9283-fbf5f166ebb2" joined connection "$bb241ab4-29aa-4ba5-8249-60f0255682eb" (1 users now present) guacd-1 | guacd[439]: INFO: Local system reports 2 processor(s) are available. guacd-1 | guacd[439]: INFO: Graphical updates will be encoded using 2 worker thread(s). guacd-1 | guacd[439]: INFO: Loading keymap "base" guacd-1 | guacd[439]: INFO: Loading keymap "en-us-qwerty" nginx-1 | "04/Jun/2025:10:01:03 +0000" client=10.50.4.30 request="GET /api/session/tunnels/38280f59-6df7-3c6d-921e-160bc92473db/protocol HTTP/1.1" status=200 bytes_sent=1731 body_bytes_sent=1391 referer= https://guac.example.com/ <https://wde-dsdev-2.sycamoreinformatics.com/> user_agent="Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/136.0.0.0 Safari/537.36" request_time=0.003 upstream_response_time=0.003 nginx-1 | "04/Jun/2025:10:01:03 +0000" client=10.50.4.30 request="GET /api/session/tunnels/38280f59-6df7-3c6d-921e-160bc92473db/activeConnection/connection/sharingProfiles HTTP/1.1" status=200 bytes_sent=286 body_bytes_sent=2 referer= https://guac.example.com/ <https://wde-dsdev-2.sycamoreinformatics.com/> user_agent="Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/136.0.0.0 Safari/537.36" request_time=0.036 upstream_response_time=0.036 nginx-1 | "04/Jun/2025:10:01:05 +0000" client=10.50.4.30 request="HEAD /api/session HTTP/1.1" status=204 bytes_sent=265 body_bytes_sent=0 referer=https://guac.example.com/ <https://wde-dsdev-2.sycamoreinformatics.com/> user_agent="Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/136.0.0.0 Safari/537.36" request_time=0.002 upstream_response_time=0.001 guacamole-1 | 10:01:10.264 [http-nio-8080-exec-4] INFO o.a.g.tunnel.TunnelRequestService - User "administrator" disconnected from connection "1". Duration: 7453 milliseconds guacamole-1 | Exception in thread "Thread-40" java.lang.IllegalStateException: Message will not be sent because the WebSocket session has been closed guacamole-1 | at org.apache.tomcat.websocket.WsRemoteEndpointImplBase.writeMessagePart(WsRemoteEndpointImplBase.java:454) guacamole-1 | at org.apache.tomcat.websocket.WsRemoteEndpointImplBase.sendMessageBlockInternal(WsRemoteEndpointImplBase.java:312) guacamole-1 | at org.apache.tomcat.websocket.WsRemoteEndpointImplBase.sendMessageBlock(WsRemoteEndpointImplBase.java:265) guacamole-1 | at org.apache.tomcat.websocket.WsRemoteEndpointImplBase.sendMessageBlock(WsRemoteEndpointImplBase.java:249) guacamole-1 | at org.apache.tomcat.websocket.WsRemoteEndpointImplBase.sendString(WsRemoteEndpointImplBase.java:191) guacamole-1 | at org.apache.tomcat.websocket.WsRemoteEndpointBasic.sendText(WsRemoteEndpointBasic.java:36) guacamole-1 | at org.apache.guacamole.websocket.GuacamoleWebSocketTunnelEndpoint.sendInstruction(GuacamoleWebSocketTunnelEndpoint.java:152) guacamole-1 | at org.apache.guacamole.websocket.GuacamoleWebSocketTunnelEndpoint.access$200(GuacamoleWebSocketTunnelEndpoint.java:53) guacamole-1 | at org.apache.guacamole.websocket.GuacamoleWebSocketTunnelEndpoint$2.run(GuacamoleWebSocketTunnelEndpoint.java:253) guacd-1 | guacd[439]: INFO: RDP server closed/refused connection: Server refused connection (wrong security type?) guacd-1 | guacd[439]: INFO: User "@60fe8d0f-411b-4b09-9283-fbf5f166ebb2" disconnected (0 users remain) guacd-1 | guacd[439]: INFO: Last user of connection "$bb241ab4-29aa-4ba5-8249-60f0255682eb" disconnected guacd-1 | guacd[1]: INFO: Connection "$bb241ab4-29aa-4ba5-8249-60f0255682eb" removed. RDP server closed/refused connection: Server refused connection (wrong security type?) Is this a known issue? But if I just downgrade the version to 1.5.5 or below, it works. Thanks Subba
