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Permission denied: I can no longer access my files

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Answer: 

I can no longer read or write to my files and none of my applications work. Doing 'ls' command returns permission denied.

If you have left yourself logged in for over 18 hours on a DICE machine remotely via ssh, or logged in at the front but are not using the gnome-screenlock then your AFS and kerberos credentials will have expired.

Instead of logging out, you can do the command 'renc' which will prompt you to re-enter your password.

Always use gnome-screenlock as this will automatically renew your credentials when you enter your password to unlock the screen.

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