Hi Rubens,

I must admit I'm not really knowledgeable about Kerberos, but since you
say the authentication is succeeding, but you end up with a blank screen
afterwards, it would be interesting to know which session type you were
using (KDE, GNOME, XFCE, LXDE, ... or maybe Published Applications or a
single application) - maybe your problem isn't related to Kerberos at
all.  Also, what happens when you switch to a different session type?

And what is the output of "klist -fv"?  Is the ticket Proxyable,
Forwardable, Initial?

Hello Stefan, thanks for the reply.

It's not exactly a blank screen, I took a screenshot of the error with the --debug log besides it:
https://drive.google.com/open?id=1cgBI3-ARfW4IDdnJeG-4K_iSAhjXuEoz

I'm trying to log in to LXDE, and when I try XFCE, Published Apps and even Terminal I get the same problem. Also, monitoring the syslog on the X2Go server machine I see no X2Go activity during these attempts. Anywhere else I should look that could help troubleshooting this?

After I issue the initial ticket and unsuccessfully attempt an X2Go login, "klist -f" outputs:

Ticket cache: FILE:/tmp/krb5cc_1000
Default principal: remoto@KERBEROS.COM

Valid starting       Expires              Service principal
23/01/2019 09:38:56  23/01/2019 19:38:56  krbtgt/KERBEROS.COM@KERBEROS.COM
    renew until 24/01/2019 09:38:53, Flags: FPRIA
23/01/2019 09:39:06  23/01/2019 19:38:56  host/newhost.com@
    renew until 24/01/2019 09:38:53, Flags: FPRAT
23/01/2019 09:39:06  23/01/2019 19:38:56  host/newhost.com@KERBEROS.COM
    renew until 24/01/2019 09:38:53, Flags: FPRAT

Again, any help is appreciated.

Regards,
Rubens