On Tue, May 14, 2024 at 11:13 AM Viji Shankar <vijishankar...@gmail.com> wrote:
> Hi Team, > > We are using Linux (Ubuntu 22.04). We have rebooted Ubuntu after an update > and also restarted the Guacamole Pod. We are using Guacamole 1.5.3. > services are also running. We have checked guacamole container logs. We are > getting this following error, > > > > > > > > > *Exception in thread "Thread-886" java.lang.IllegalStateException: Message > will not be sent because the WebSocket session has been closed at > org.apache.tomcat.websocket.WsRemoteEndpointImplBase.writeMessagePart(WsRemoteEndpointImplBase.java:449) > at > org.apache.tomcat.websocket.WsRemoteEndpointImplBase.sendMessageBlock(WsRemoteEndpointImplBase.java:307) > at > org.apache.tomcat.websocket.WsRemoteEndpointImplBase.sendMessageBlock(WsRemoteEndpointImplBase.java:249) > at > org.apache.tomcat.websocket.WsRemoteEndpointImplBase.sendString(WsRemoteEndpointImplBase.java:191) > at > org.apache.tomcat.websocket.WsRemoteEndpointBasic.sendText(WsRemoteEndpointBasic.java:36) > at > org.apache.guacamole.websocket.GuacamoleWebSocketTunnelEndpoint.sendInstruction(GuacamoleWebSocketTunnelEndpoint.java:152) > at > org.apache.guacamole.websocket.GuacamoleWebSocketTunnelEndpoint.access$200(GuacamoleWebSocketTunnelEndpoint.java:53)* > > The first thing to check, if you're proxying Guacamole behind Nginx or Apache httpd, or any other reverse proxy, is that you've configured the reverse proxy correctly. The parameters required are in the manual: https://guacamole.apache.org/doc/gug/reverse-proxy.html In particular, for Nginx, make sure buffering is disabled. Beyond that, you'll need to dig into log files and do some additional network troubleshooting to figure out why the WebSocket session is being closed prematurely. If there's some web application firewall or SSL inspection going on in the path between the browser and the Tomcat server, it could be interfering with the WebSocket connection. You'll need to figure out why. -Nick >
