Ok really disappointed as the issue is continue happen even though I am now running the latest version. I have used docker and this image: https://github.com/oznu/docker-guacamole ( I am running on armv7)
Now when trying to establish an SSH connection with PKA, I cannot get access the terminal even though everything succeeds. A screenshot is provided showing the established connection <http://apache-guacamole-general-user-mailing-list.2363388.n4.nabble.com/file/t816/connection-error.png> . I run raspbian as OS and my private key length is 4096bit. Here is the log: guacd[250]: INFO: Creating new client for protocol "ssh" guacd[250]: INFO: Connection ID is "$1bdf6491-890e-4708-92d0-abb9d6fc4be5" guacd[348]: INFO: User "@840f97cf-4890-1827-a39f-f3ddc938bf8d" joined connection "$1bdf6491-d90e-4709-92d0-abb9d6fc4be5" (1 users now present) 03:11:12.356 [http-nio-8080-exec-4] INFO o.a.g.tunnel.TunnelRequestService - User "test" connected to connection "76". guacd[348]: INFO: Auth key successfully imported. guacd[348]: WARNING: No known host keys provided, host identity will not be verified. guacd[348]: INFO: SSH connection successful. guacd[348]: INFO: User "@840f97cf-4890-1827-a39f-f3ddc938bf8d" disconnected (0 users remain) guacd[348]: INFO: Last user of connection "$1bdf6491-890e-4708-92d0-abb9d6fc4be5" disconnected guacd[348]: INFO: SSH connection ended. -- Sent from: http://apache-guacamole-general-user-mailing-list.2363388.n4.nabble.com/