Hi all, 

perhaps I give it a try to propose a solution (correct an error). 

The session was started correctly by nxagent (/var/log/user.log), but
the traffic was not routed to the right ports (see /var/log/auth.log)
due to a missing parameter in ssh-configuration

Solution: 

- Open /etc/ssh/sshd_conf (my version: OpenSSH_6.7p1 Debian-5+deb8u4)
- Set Parameter "AllowTcpForwarding" to "yes" 
- Restart ssh-Service
- Open x2go-Session and - hopefully - all is fine. 

Hope it helps


Carsten