[X2Go-Dev] Bug#1265: Remote proxy closed session while negotiating the connection.

Package: nxproxy (guessing) Version: xenial 2:3.5.0.33-0~710~ubuntu16.04.1 amd64

It appears to be connecting then aborts with a pop-up:

The remote proxy closed the connection while negotiating the session. This may be due to the wrong authentication credentials passed to the server.

The main window very briefly displays this message:

Loop: PANIC! Failure negotiating the session in stage '7'. Error: Failure negotiating the session in stage '7'. Loop: PANIC! Wrong version or invalid session authentication cookie. Error: Wrong version or invalid session authentication cookie. Session: Terminating session at 'Tue Feb 27 02:54;49 2018'. Session: Session terminated at 'Tue Feb 27 02:54;49 2018'.

 The server is Zircon 12.2 and the Client is Ubuntu 17.10.

 This was working yesterday, I installed nightly builds and it did not

work at all, then purged everything and went back to daily and now I get this.