LCD computing troubleshooting

This page presents several tips on several issues found when using SLC6 or SLC5

timeout in locking authority file /home/username/.Xauthority

When logging on a machine with ssh (e.g. from lxplus to your desktop PC) with X11 forwarding, you get an error

/usr/bin/xauth:  timeout in locking authority file /home/username/.Xauthority

This happens because of selinux. You need to check the status of selinux

sestatus

should give you in the case of the presence of the error something like

SELinux status:                 enabled
SELinuxfs mount:                /selinux
Current mode:                   enforcing
Mode from config file:          enforcing
Policy version:                 24
Policy from config file:        targeted

As you see the current status is enforcing, and that's what is causing the problem. You need to become root with su then run

setenforce 0

and this should then make the output of sestatus look like

SELinux status:                 enabled
SELinuxfs mount:                /selinux
Current mode:                   permissive
Mode from config file:          enforcing
Policy version:                 24
Policy from config file:        targeted

Now you should be able to log on the machine using ssh.

Source: http://stackoverflow.com/questions/8154963/ssh-x11-forwarding-wont-work