In ECCE when you highlight a running job on a remote server which you've set up with the frontendMachine option (here and here and here) which is a ROCKS 5.4.3/CentOS server and e.g. hit Alt+L or "Run Mgmt"/"Tail -f on Output file" and nothing happens, and when you set ECCE to provide verbose output (add "ECCE_RCOM_LOGMODE true" to ecce/apps/siteconfig/site_runtime) you see the following errors:
andX11 connection rejected because of wrong authentication. X connection to localhost:43.0 broken (explicit kill or server shutdown).
Obviously there are non-ECCE related situation where you may see these errors too. Doesn't matter -- same solution.OpenSSH_4.3p2, OpenSSL 0.9.8e-fips-rhel5 01 Jul 2008 Warning: untrusted X11 forwarding setup failed: xauth key data not generated Warning: No xauth data; using fake authentication data for X11 forwarding.
cat /etc/ssh/sshd_config |grep X11X11Forwarding yes X11DisplayOffset 10cat /etc/ssh/ssh_config |grep X11|grep -v ^#ForwardX11 yessudo cat /etc/ssh/sshd_config |grep X11|grep -v ^#X11Forwarding yes X11DisplayOffset 10
So, why localhost:43? And why isn't it working? From my workstation to the cluster which is connected to the net via the front node, and then from the cluster front to the cluster front's local name.
ssh -X server.external.dns echo $DISPLAYyetlocalhost:42.0ssh -X server.local.dnsWarning: untrusted X11 forwarding setup failed: xauth key data not generated Warning: No xauth data; using fake authentication data for X11 forwarding.echo $DISPLAYlocalhost:44.0
ssh -Y server.local.dns
Simpler than I thought:
I edited ~/.ssh/config on the server, and did
Host server.local.dns Hostname server.local.dns User me ForwardX11 yes ForwardX11Trusted yes
And now it works!
Presumably I could've just edited /etc/ssh_config instead, but it's a multi-user cluster and I'm happier to change things on a user-by-user basis.