[X2Go-User] ssh to anode failing from inside of a x2go session

[Josep Manel Andrés Moscardó]

That was exactly it.... Thanks a lot.

It was weird, since I would say that I had it working before, and I
don't remember any change going on the infrastructure.

But thanks a lot.



On 13/11/18 16:14, Stefan Baur wrote:
> Am 13.11.18 um 15:49 schrieb Josep Manel Andrés Moscardó:
>> Hi,
>> I have a connection to a x2go server (slurm login node) that works fine,
>> but my issue is that when I open a terminal and try to ssh into a node
>> it just hangs until it times out.
>>
>> Is there any restriction for it?
>>
>> I am connecting to the x2go server using password or ssh key, and trying
>> to ssh to the node using ssh key or password, it doesn't matter.
>>
>> Thanks.
> 
> Using a key file isn't trivial in this situation.  I would suggest
> making your first attempts using a regular username/password combinations.
> 
> First, try pinging the destination server from within the X2Go session.
> 
> If you can't ping it, the problem might not be with SSH but with an
> underlying network (mis)configuration).  Running traceroute and looking
> at/posting the output can't hurt, either.
> 
> Also, crank up the verbosity level of the ssh client inside the X2Go
> session like so:
> 
> ssh -vvv user at host
> 
> You might also want to try to ping with larger packet sizes, like so:
> 
> ping -s 1500 host
> 
> if a regular ping works, but it fails when specifying "-s 1500", it
> might be an MTU issue.  Start decreasing the number until you can get a
> successful ping through, then set the MTU on the interface to that value.
> 
> -Stefan
> 

-- 
Josep Manel Andrés Moscardó
Systems Engineer, IT Operations
EMBL Heidelberg
T +49 6221 387-8394

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