iCal Server problems

I have iCal on my laptop and iCal Server running on my server. Every day I am prompted to retype my password in iCal with an error that my password is incorrect (how can it be incorrect if the domain password is used everywhere else fine?). Looking in the iCal server logs I see this error message repeated:

2012-01-22 19:33:25-0500 [-] [caldav-8009] [PooledMemCacheProtocol,client] [twistedcaldav.directory.appleopendirectory.OpenDirectoryRecord#error] OpenDirectory (node=/Search) error while performing digest authentication for user savarese: ('DirectoryServices Error: Exception raised in file src/CDirectoryService.cpp at line 1078', -14002)

Has anybody seen this error? What does it mean? How do I fix it?

Thanks,

Scott