Re: ssh disconnects immediately after successful login

[David Christensen <dpchrist@holgerdanske.com>]

On 12/16/2015 05:29 AM, Kent West wrote:
> If I try to connect to my Debian box at work, using either my Mac's OS X
> or my Mac's Debian VM, I can connect successfully, but then immediately
> the connection is closed:
>
> Kents-MacBook-Pro:~ westk$ ssh -Y westk@westek.acu.edu
> westk@westek.acu.edu's password:
> Connection to westek.acu.edu closed by remote host.
> Connection to westek.acu.edu closed.
> Kents-MacBook-Pro:~ westk$
>
> I can ssh to a different Debian box on my work network, and then do an
> ssh hop from there to my work box.
>
> Also, if I start up the Virtual Private Network (VPN) client first, so
> that I'm essentially on my work network rather than on my home network,
> I get connected successfully.
>
> So apparently something about my Debian box at work doesn't like
> incoming ssh sessions from non-work networks. However, I can find
> nothing to configure that.

Which version of Debian?


The following ideas are for Jessie.


'man ssh' tells me:

     -v      Verbose mode.  Causes ssh to print debugging messages
             about its progress.  This is helpful in debugging connec-
             tion, authentication, and configuration problems.  Multi-
             ple -v options increase the verbosity.  The maximum is 3.

Add the -v option, one or more times, and see what happens.


On the destination computer, take a look at the files in /var/log 
(notably auth.log and syslog).


David