Thank you.
Here is the last 10 minutes of /car/log/caldavd/error.log -- and just before I copied this, I tried to go online with an iCal account from a client machine:
2011-10-27 08:19:24-0700 [-] [mailgateway] 2011-10-27 08:19:24-0700 [IMAP4DownloadProtocol,client] Unhandled unsolicited response: ['OK', ['HIGHESTMODSEQ', '1'], 'Highest']
2011-10-27 08:19:24-0700 [-] [mailgateway] 2011-10-27 08:19:24-0700 [IMAP4DownloadProtocol,client] Unhandled unsolicited response: ['OK', ['URLMECH', 'INTERNAL'], 'Mechanisms', 'supported']
2011-10-27 08:19:54-0700 [-] [mailgateway] 2011-10-27 08:19:54-0700 [IMAP4DownloadProtocol,client] Unhandled unsolicited response: ['OK', ['HIGHESTMODSEQ', '1'], 'Highest']
2011-10-27 08:19:54-0700 [-] [mailgateway] 2011-10-27 08:19:54-0700 [IMAP4DownloadProtocol,client] Unhandled unsolicited response: ['OK', ['URLMECH', 'INTERNAL'], 'Mechanisms', 'supported']
2011-10-27 08:20:24-0700 [-] [mailgateway] 2011-10-27 08:20:24-0700 [IMAP4DownloadProtocol,client] Unhandled unsolicited response: ['OK', ['HIGHESTMODSEQ', '1'], 'Highest']
2011-10-27 08:20:24-0700 [-] [mailgateway] 2011-10-27 08:20:24-0700 [IMAP4DownloadProtocol,client] Unhandled unsolicited response: ['OK', ['URLMECH', 'INTERNAL'], 'Mechanisms', 'supported']
2011-10-27 08:20:54-0700 [-] [mailgateway] 2011-10-27 08:20:54-0700 [IMAP4DownloadProtocol,client] Unhandled unsolicited response: ['OK', ['HIGHESTMODSEQ', '1'], 'Highest']
2011-10-27 08:20:54-0700 [-] [mailgateway] 2011-10-27 08:20:54-0700 [IMAP4DownloadProtocol,client] Unhandled unsolicited response: ['OK', ['URLMECH', 'INTERNAL'], 'Mechanisms', 'supported']
2011-10-27 08:21:25-0700 [-] [mailgateway] 2011-10-27 08:21:25-0700 [IMAP4DownloadProtocol,client] Unhandled unsolicited response: ['OK', ['HIGHESTMODSEQ', '1'], 'Highest']
2011-10-27 08:21:25-0700 [-] [mailgateway] 2011-10-27 08:21:25-0700 [IMAP4DownloadProtocol,client] Unhandled unsolicited response: ['OK', ['URLMECH', 'INTERNAL'], 'Mechanisms', 'supported']
2011-10-27 08:21:55-0700 [-] [mailgateway] 2011-10-27 08:21:55-0700 [IMAP4DownloadProtocol,client] Unhandled unsolicited response: ['OK', ['HIGHESTMODSEQ', '1'], 'Highest']
2011-10-27 08:21:55-0700 [-] [mailgateway] 2011-10-27 08:21:55-0700 [IMAP4DownloadProtocol,client] Unhandled unsolicited response: ['OK', ['URLMECH', 'INTERNAL'], 'Mechanisms', 'supported']
2011-10-27 08:21:55-0700 [-] [caldav-2] [QueryProtocol,client] [twext.web2.server#error] [Failure instance: Traceback (failure with no frames): <type 'exceptions.ValueError'>: ('302', 'Found')
2011-10-27 08:21:55-0700 [-] [caldav-2] ]
2011-10-27 08:22:25-0700 [-] [mailgateway] 2011-10-27 08:22:25-0700 [IMAP4DownloadProtocol,client] Unhandled unsolicited response: ['OK', ['HIGHESTMODSEQ', '1'], 'Highest']
2011-10-27 08:22:25-0700 [-] [mailgateway] 2011-10-27 08:22:25-0700 [IMAP4DownloadProtocol,client] Unhandled unsolicited response: ['OK', ['URLMECH', 'INTERNAL'], 'Mechanisms', 'supported']
2011-10-27 08:22:55-0700 [-] [mailgateway] 2011-10-27 08:22:55-0700 [IMAP4DownloadProtocol,client] Unhandled unsolicited response: ['OK', ['HIGHESTMODSEQ', '1'], 'Highest']
2011-10-27 08:22:55-0700 [-] [mailgateway] 2011-10-27 08:22:55-0700 [IMAP4DownloadProtocol,client] Unhandled unsolicited response: ['OK', ['URLMECH', 'INTERNAL'], 'Mechanisms', 'supported']
2011-10-27 08:23:25-0700 [-] [mailgateway] 2011-10-27 08:23:25-0700 [IMAP4DownloadProtocol,client] Unhandled unsolicited response: ['OK', ['HIGHESTMODSEQ', '1'], 'Highest']
2011-10-27 08:23:25-0700 [-] [mailgateway] 2011-10-27 08:23:25-0700 [IMAP4DownloadProtocol,client] Unhandled unsolicited response: ['OK', ['URLMECH', 'INTERNAL'], 'Mechanisms', 'supported']
2011-10-27 08:23:56-0700 [-] [mailgateway] 2011-10-27 08:23:56-0700 [IMAP4DownloadProtocol,client] Unhandled unsolicited response: ['OK', ['HIGHESTMODSEQ', '1'], 'Highest']
2011-10-27 08:23:56-0700 [-] [mailgateway] 2011-10-27 08:23:56-0700 [IMAP4DownloadProtocol,client] Unhandled unsolicited response: ['OK', ['URLMECH', 'INTERNAL'], 'Mechanisms', 'supported']
2011-10-27 08:24:26-0700 [-] [mailgateway] 2011-10-27 08:24:26-0700 [IMAP4DownloadProtocol,client] Unhandled unsolicited response: ['OK', ['HIGHESTMODSEQ', '1'], 'Highest']
2011-10-27 08:24:26-0700 [-] [mailgateway] 2011-10-27 08:24:26-0700 [IMAP4DownloadProtocol,client] Unhandled unsolicited response: ['OK', ['URLMECH', 'INTERNAL'], 'Mechanisms', 'supported']
2011-10-27 08:24:56-0700 [-] [mailgateway] 2011-10-27 08:24:56-0700 [IMAP4DownloadProtocol,client] Unhandled unsolicited response: ['OK', ['HIGHESTMODSEQ', '1'], 'Highest']
2011-10-27 08:24:56-0700 [-] [mailgateway] 2011-10-27 08:24:56-0700 [IMAP4DownloadProtocol,client] Unhandled unsolicited response: ['OK', ['URLMECH', 'INTERNAL'], 'Mechanisms', 'supported']
2011-10-27 08:25:27-0700 [-] [mailgateway] 2011-10-27 08:25:27-0700 [IMAP4DownloadProtocol,client] Unhandled unsolicited response: ['OK', ['HIGHESTMODSEQ', '1'], 'Highest']
2011-10-27 08:25:27-0700 [-] [mailgateway] 2011-10-27 08:25:27-0700 [IMAP4DownloadProtocol,client] Unhandled unsolicited response: ['OK', ['URLMECH', 'INTERNAL'], 'Mechanisms', 'supported']
2011-10-27 08:25:57-0700 [-] [mailgateway] 2011-10-27 08:25:57-0700 [IMAP4DownloadProtocol,client] Unhandled unsolicited response: ['OK', ['HIGHESTMODSEQ', '1'], 'Highest']
2011-10-27 08:25:57-0700 [-] [mailgateway] 2011-10-27 08:25:57-0700 [IMAP4DownloadProtocol,client] Unhandled unsolicited response: ['OK', ['URLMECH', 'INTERNAL'], 'Mechanisms', 'supported']
2011-10-27 08:26:27-0700 [-] [mailgateway] 2011-10-27 08:26:27-0700 [IMAP4DownloadProtocol,client] Unhandled unsolicited response: ['OK', ['HIGHESTMODSEQ', '1'], 'Highest']
2011-10-27 08:26:27-0700 [-] [mailgateway] 2011-10-27 08:26:27-0700 [IMAP4DownloadProtocol,client] Unhandled unsolicited response: ['OK', ['URLMECH', 'INTERNAL'], 'Mechanisms', 'supported']
2011-10-27 08:26:42-0700 [-] [caldav-2] [PooledMemCacheProtocol,client] [twistedcaldav.directory.principal#error] No principal found for UID: 8383CE17-684C-4E27-BEE6-556E8953462B
2011-10-27 08:26:53-0700 [-] [caldav-1] [QueryProtocol,client] [twext.web2.server#error] [Failure instance: Traceback (failure with no frames): <type 'exceptions.ValueError'>: ('302', 'Found')
2011-10-27 08:26:53-0700 [-] [caldav-1] ]
2011-10-27 08:26:56-0700 [-] [caldav-0] [PooledMemCacheProtocol,client] [twistedcaldav.directory.principal#error] No principal found for UID: 5636C23E-CF0B-4781-A94D-5B430A956654
2011-10-27 08:26:56-0700 [-] [caldav-2] [PooledMemCacheProtocol,client] [twistedcaldav.directory.principal#error] No principal found for UID: 3B949A35-D1D0-4BFC-AEA2-449CB300F322
2011-10-27 08:26:57-0700 [-] [mailgateway] 2011-10-27 08:26:57-0700 [IMAP4DownloadProtocol,client] Unhandled unsolicited response: ['OK', ['HIGHESTMODSEQ', '1'], 'Highest']
2011-10-27 08:26:57-0700 [-] [mailgateway] 2011-10-27 08:26:57-0700 [IMAP4DownloadProtocol,client] Unhandled unsolicited response: ['OK', ['URLMECH', 'INTERNAL'], 'Mechanisms', 'supported']
2011-10-27 08:27:27-0700 [-] [mailgateway] 2011-10-27 08:27:27-0700 [IMAP4DownloadProtocol,client] Unhandled unsolicited response: ['OK', ['HIGHESTMODSEQ', '1'], 'Highest']
2011-10-27 08:27:27-0700 [-] [mailgateway] 2011-10-27 08:27:27-0700 [IMAP4DownloadProtocol,client] Unhandled unsolicited response: ['OK', ['URLMECH', 'INTERNAL'], 'Mechanisms', 'supported']
2011-10-27 08:27:57-0700 [-] [mailgateway] 2011-10-27 08:27:57-0700 [IMAP4DownloadProtocol,client] Unhandled unsolicited response: ['OK', ['HIGHESTMODSEQ', '1'], 'Highest']
2011-10-27 08:27:57-0700 [-] [mailgateway] 2011-10-27 08:27:57-0700 [IMAP4DownloadProtocol,client] Unhandled unsolicited response: ['OK', ['URLMECH', 'INTERNAL'], 'Mechanisms', 'supported']
2011-10-27 08:28:27-0700 [-] [mailgateway] 2011-10-27 08:28:27-0700 [IMAP4DownloadProtocol,client] Unhandled unsolicited response: ['OK', ['HIGHESTMODSEQ', '1'], 'Highest']
2011-10-27 08:28:27-0700 [-] [mailgateway] 2011-10-27 08:28:27-0700 [IMAP4DownloadProtocol,client] Unhandled unsolicited response: ['OK', ['URLMECH', 'INTERNAL'], 'Mechanisms', 'supported']
2011-10-27 08:28:40-0700 [-] [caldav-3] [QueryProtocol,client] [twext.web2.server#error] [Failure instance: Traceback (failure with no frames): <type 'exceptions.ValueError'>: ('302', 'Found')
2011-10-27 08:28:40-0700 [-] [caldav-3] ]
2011-10-27 08:28:46-0700 [-] [caldav-2] [QueryProtocol,client] [twext.web2.server#error] [Failure instance: Traceback (failure with no frames): <type 'exceptions.ValueError'>: ('302', 'Found')
2011-10-27 08:28:46-0700 [-] [caldav-2] ]
2011-10-27 08:28:46-0700 [-] [caldav-3] [QueryProtocol,client] [twext.web2.server#error] [Failure instance: Traceback (failure with no frames): <type 'exceptions.ValueError'>: ('302', 'Found')
2011-10-27 08:28:46-0700 [-] [caldav-3] ]
2011-10-27 08:28:57-0700 [-] [mailgateway] 2011-10-27 08:28:57-0700 [IMAP4DownloadProtocol,client] Unhandled unsolicited response: ['OK', ['HIGHESTMODSEQ', '1'], 'Highest']
2011-10-27 08:28:57-0700 [-] [mailgateway] 2011-10-27 08:28:57-0700 [IMAP4DownloadProtocol,client] Unhandled unsolicited response: ['OK', ['URLMECH', 'INTERNAL'], 'Mechanisms', 'supported']
2011-10-27 08:29:27-0700 [-] [mailgateway] 2011-10-27 08:29:27-0700 [IMAP4DownloadProtocol,client] Unhandled unsolicited response: ['OK', ['HIGHESTMODSEQ', '1'], 'Highest']
2011-10-27 08:29:27-0700 [-] [mailgateway] 2011-10-27 08:29:27-0700 [IMAP4DownloadProtocol,client] Unhandled unsolicited response: ['OK', ['URLMECH', 'INTERNAL'], 'Mechanisms', 'supported']