On 07.08.2015 01:37 AM, Lukas Koschmieder wrote: > Package: x2goclient > Version: 4.0.4.0 Please try upgrading to 4.0.5.0. I have fixed a few bugs regarding GSSAPI/Kerberos in that version - maybe that already solves your problem. > I have noticed that this error > disappears as soon as a user establishes his first SSH connection to my > X2Go server (using PuTTY). Additionally, this might not be a bug at all. X2Go Client expects a valid Kerberos ticket to be available. Typically, Windows users that use Kerberos already get a ticket at login time via AD or the like. If that is not true for your setup, you will have to request a new ticket manually the first time after login - and are responsible to also keep it from expiring (e.g., via periodically requesting a new ticket or requesting a renewable ticket and running the renew command every now and then.) Mihai