If you try to save a file after you've been logged in over 10 hours, you
will get a "permission denied" error of some sort. This happens
because, after 10 hours, your authentication to Athena expires. In
order to be able to use your account again without interruption, all you
need to do is reauthenticate yourself. You can do this by typing (at
the athena% prompt):

        renew

and entering your password when prompted.

If you get the following error:

athena% renew
renew: Command not found.

then you should be able to manually get your authentication back by
doing the following at the terminal window's prompt:

kinit $USER

fsid -a ; zctl load /dev/null

You should be all set now!  Go ahead and save your files.  It should
work just fine.  You should have no problems for the next 10 hours.

(last updated Dec 04 2001)