Hi, 
Already 2 weeks I am fighting with an error as above.  Software is running on tomcat8(debian 8) on orange pi one hardware.  Catalina.out says:

22:27:25.057 [http-nio-8080-exec-16] ERROR o.a.g.w.GuacamoleWebSocketTunnelEndpoint - Creation of WebSocket tunnel to guacd failed: Connection to guacd timed o

Any ideas what is the cause?
regars, 
Radomir