Hi,
today I experienced reconnect problems with a freshly compiled version 3.5.99.18 that contains my Boolean rework patch (Hash 16cd2bbe1c4425e3fa557f9ca0723aa94a50b071) (with my own script, not with x2go):
NXPROXY: Session: Starting session at 'Thu Feb 14 16:48:19 2019'. NXPROXY: Info: Using errors file '/home/sibiller/.nx/S-anubis-9950-5e12c34496d7e97404f52f87ae808411/errors'. NXPROXY: Info: Using stats file '/home/sibiller/.nx/S-anubis-9950-5e12c34496d7e97404f52f87ae808411/stats'. NXPROXY: Loop: WARNING! Overriding auxiliary X11 port with new value '1'. NXPROXY: Warning: Overriding auxiliary X11 port with new value '1'. NXPROXY: Info: Using abstract X11 socket in kernel namespace for accessing DISPLAY=:7787. NXPROXY: Info: Connecting to remote host 'localhost:13950'. NXPROXY: Info: Connected to remote proxy on FD#6. NXPROXY: Loop: PANIC! The remote NX proxy closed the connection. NXPROXY: Error: The remote NX proxy closed the connection. NXPROXY: Loop: PANIC! Failure negotiating the session in stage '7'. NXPROXY: Error: Failure negotiating the session in stage '7'. NXPROXY: Loop: PANIC! Wrong version or invalid session authentication cookie. NXPROXY: Error: Wrong version or invalid session authentication cookie. NXPROXY: Session: Terminating session at 'Thu Feb 14 16:48:19 2019'. NXPROXY: Session: Session terminated at 'Thu Feb 14 16:48:19 2019'. NXPROXY: Warning: Couldn't start '/usr/NX/bin/nxclient'. Error is 2 'No such file or directory'. NXPROXY: Warning: Trying with path '/usr/NX/bin:/opt/NX/bin:/usr/local/NX/bin:/home/sibiller/bin/amd64-linux/RedHatEL-7:/home/sibiller/bin/amd64-linux:/home/sibiller/bin:/usr/local/bin:/bin:/usr/bin:/usr/bin/X11:/opt/kde/bin:.:/usr/bin:/usr/bin:/scr/anubis/sibiller/go/go/bin:/scr/anubis/sibiller/go/packages/bin:/usr/bin'.
This is totally repeatable for 16cd2bbe1c4425e3fa557f9ca0723aa94a50b071 and works with 427ac344c53acf4cb361f24e1df771137f83ea6b. So we might need to revoke (and rework) that one...
Uli