[X2Go-User] Problem connecting to Centos 7 (x2go 4.0.1.19).

[Mihai Moldovan]

On 05.08.2015 03:30 PM, Will Smith wrote:
> Dear All,
>  
> I'm having a stange problem when attemping to connect to my Centos server using
> x2goclients (Ubuntu & mac, 4.0.5.0). I'm running firewalld, but port 22 is
> unblocked and I am able to ssh into the machine and forward X traffic.  When
> accessing from both a mac and an ubuntu client the session appears to start, but
> then immediately disconnects.  The client logs say:
>  
> Info: Proxy running in client mode with pid '12054'.
> Session: Starting session at 'Wed Aug  5 12:38:47 2015'.
> Info: Using abstract X11 socket in kernel namespace for accessing DISPLAY=:0.
> Info: Connecting to remote host 'localhost:31003'.
> Info: Connection to remote proxy 'localhost:31003' established.
> Error: The remote NX proxy closed the connection.
> Error: Failure negotiating the session in stage '7'.
> Error: Wrong version or invalid session authentication cookie.
> Session: Terminating session at 'Wed Aug  5 12:38:53 2015'.
> Session: Session terminated at 'Wed Aug  5 12:38:53 2015'.
>  
>  
> If I attempt to reconnect, I can see the session, but am unable to resume it.
>  The strange thing is that if I stop firewalld, I'm able to access the server
> from both clients with no issues, which implies it's a firewall issue, but as I
> say port 22 is unblocked and I can forward X traffic.  Is there some other
> obvious firewall setting I've failed do?  Any assistance in fixing or diagnosing
> this issue would be highly appreciated.

X2Go makes extensive use of SSH tunnels. I suspect your firewall is too strict
and denies access from localhost to localhost. Please make sure that locally,
all connections are allowed.



Mihai

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