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..