Sometimes, some number of hours after login, my machine says “permission denied” when I try to access my home-directory. Whats going on?
Kerberos works by handing out a master authentication “ticket”, called the Ticket Generating Ticket (or TGT) on login, which is then used to generate “service tickets” for various other kinds of network service, AFS being one. This master ticket has a Time To Live (TTL) set by default to ten hours. Once the ticket expires, authentication fails, and the user is forced to re-authenticate. See the Ticket Expiration in the Kerberos FAQ for additional details. Since the TGT has a TTL of ten hours it’s likely that a “permission denied” message when trying to access your home-directory, even after login, is due to your ticket having expired. The simplest fix is to simply log in in the morning and log off in the evening, instead of leaving your session running overnight.
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