[X2Go-Dev] Bug#1102: Kerberos (GSSAPI) auth fails there is an sshd banner and the client is on Linux (or Mac OS X)

Package: x2goclient Version: 4.0.5.2

When the following conditions are met:

1. You are using Kerberos (GSSAPI) auth
2. You are using the Linux client (Mac client is probably affected also, although I have not tested it. Windows is unaffected, I tested it.)
3. A "banner" is enabled on the SSH server
4. x2golistsessions lists no sessions. e.g., you do not already have a session running. Kerberos (GSSAPI) auth fails.

This is because the x2goclient code considers the connection to have failed if the ssh command has 0 length standard output (in between the delimeters), but it does have standard error. A connection is made to the remote system to run x2golistsessions, which returns no standard output when there are no existing sessions. However, the ssh command outputs the banner on standard error.

Note that the banner is outputted in a popup window, as if it were an SSH connection error. This is a separate bug IMHO.