As root, I'm connecting to a remote host to execute a command. Only standarduser has the appropriate id-file and correct .ssh/config, so I'm switching the user first:su standarduser -c 'ssh -x remotehost ./remotecommand'The command works fine, but despite the fact that I used -x (disable X11-Forwarding) and having X11Forwards disabled in /etc/ssh/ssh_config, I still get the error message:X11 connection rejected because of wrong authentication.I'm not getting the error message when I'm logged in as standarduser.This is quite annoying as I would like to integrate the command in a cron job file. I understand that the error message refers to the wrong authentication of root's .XAuth file, but I'm not even trying to connect via X11.Why is ssh -x not disabling the X11 connection and throwing the error message?UPDATE:The message only shows when I'm logged in within a screen, when using the command stated above on the local machine itself (without screen), I don't get an error message, so this should be fine with cron, too.I also started the same command with -v and surprisingly got the error message FIRST, even before the status information from SSH:root@localhost:~# su standarduser -c 'ssh -x remotehost ./remotecommand'X11 connection rejected because of wrong authentication.OpenSSH_6.2p2 Ubuntu-6ubuntu0.1, OpenSSL 1.0.1e 11 Feb 2013This led me to the problem itself, it is NOT the ssh which is throwing the error message, it's su:root@localhost:~# su standarduser -c 'echo Hi'X11 connection rejected because of wrong authentication.HiWhy do I only get this error within screen? How can I disable this error message?
su with error X11 connection rejected because of wrong authentication
bash;gnu screen;su;xauth