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Newer versions of the gui krb5-auth-dialog application have the ability to obtain and renew AFS tokens.
Macintosh
The buildbuilt-in System Preferences panel for managing AFS tokens does not work properly in the CNF environment. Do not use it.
Either use the AFSTokens gui application (no longer maintained, but may still work for basic functionality) or the commandline. On the commandline, type in kinit <username> followed by aklog .See below for proper formatting of your username. The "tokens" command will list your AFS tokens.
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