ccache and OS X API problem

[Dennis Putnam]

I am writing a perl script that uses the Authen:Krb5 module. The  
script is simply trying to obtain an initial ticket. The problem  
arises when I try to run the script from a PHP page. The script fails  
with the call that initializes the ccache ($cc->initialize 
($pclient)). The error, according to the author of Authen::Krb5,  
indicates that the ccache cannot be written due to a permissions  
problem.

Is someone here familiar enough with the API thing that Apple uses in  
its implementation to suggest a plan of action for debugging this?

Thanks.