hello,

i have  a calenderserver version -2.4 from apple running on a linux squeeze box and when i create a new event and send invitation to external user 
(config the imip settings)  the error below is shown:

2010-11-15 14:12:54+0100 [-] [mailgateway]       File "/usr/lib/twisted-calendarserver/lib/python2.6/site-packages/twistedcaldav/directory/digest.py", line 293, in _validate
2010-11-15 14:12:54+0100 [-] [mailgateway]         raise error.LoginFailed('nonce-count is not a valid hex string: %s' % (auth.get('nonce-count'),))
2010-11-15 14:12:54+0100 [-] [mailgateway]     twisted.cred.error.LoginFailed: nonce-count is not a valid hex string: None
2010-11-15 14:12:54+0100 [-] [mailgateway]    
2010-11-15 14:12:54+0100 [-] [caldav-8008]  [AuthorizedHTTPGetter,client] [twistedcaldav.scheduling.imip#error] Could not do server-to-imip request : <twistedcaldav.scheduling.imip.ScheduleViaIMip object at 0x903886c> 500 Internal Server Error
2010-11-15 14:12:54+0100 [-] [caldav-8008]  [AuthorizedHTTPGetter,client] [twistedcaldav.scheduling.scheduler.ScheduleResponseQueue#error] Error during PUT for mailto:ics@internetpeople.al: None

Has this anything to do with digest credentials, because i tried also to enable itc(with the error: [twistedcaldav.extensions#error] Client authentication scheme basic is not provided by server ['digest']) and still the same error for mailrouting.

thnx, any helps would be appreciated..