[X2Go-User] Getting "Access denied for 'password'. Authentication that can continue: publickey, password", used to work

[Chris Green]

On Wed, Sep 11, 2019 at 10:29:25AM +0100, Chris Green wrote:
> On Wed, Sep 11, 2019 at 10:15:32AM +0200, Stefan Baur wrote:
> > Am 11.09.19 um 10:07 schrieb Chris Green:
> > > I've been running x2go from an xubuntu laptop client to an xubuntu
> > > desktop machine successfully for a year or so.  It has now stopped
> > > working with a pop-up window that says:-
> > > 
> > >     Access denied for 'password'. Authentication that can continue:
> > >     publickey,password
> > >     Access denied for 'password'. Authentication that can continue:
> > >     publickey,password
> > > 
> > > (yes, it is repeated like that)
> > > 
> > > I have moved from xubuntu 18.04 to 19.04 (via 18.10), would this have
> > > caused the problem maybe?  
> > 
> > What happens when you use the same password for a regular SSH session,
> > from the same client?
> > 
> It all works with password authentication as it always used to, I
> spend half my life permanently connected via ssh connections between
> these machines! :-)   The upgrades 18.04 -> 18.10 -> 19.04 didn't have
> any noticeable effect on my ssh usage.
> 
> 
> > Anything in /etc/ssh/sshd_config on the server that might have changed
> > during the upgrade?  (You do have a backup you could compare it to, right?)
> > 
> Probably, I'll go and take a look.....
> 
> ... that's odd, my connection to the backup machine (using ssh) didn't
> ask for a password.  I'll clear everything down (as in reboot this
> laptop) and try all over again.  I'll be back to report what I find.
> 
Well, after a reboot of the laptop everything works perfectly!  The
non-password login to the backup machine was 'correct' as I had an ssh
connection to that machine in another window and I use 'ControlMaster'
in my ~/.ssh/config.

Why the reboot has cleared the authentication problem I don't know,
I simply did a 'restart'from the panel, I didn't even power down and
up again.

... and I did check my backups, I have incremental backups of /etc
going back to 2015-01-19. :-)  It hasn't changed in the past year
(sshd_config that is) :-

    chris at backup$ diff /b2/esprimo/2019-09-10/etc/ssh/sshd_config /b2/esprimo/2018-09-02/etc/ssh/sshd_config
    1c1
    < #     $OpenBSD: sshd_config,v 1.103 2018/04/09 20:41:22 tj Exp $
    ---
    > #     $OpenBSD: sshd_config,v 1.101 2017/03/14 07:19:07 djm Exp $

-- 
Chris Green