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I have an iCal server running, with a group calendar set up through a wiki site for all of my users. All users trying to access the calendar are members of the group. Adding, removing, modifying events (even through delegated accounts) is working fine. Email invites, however, will not work.

When using iCal (v4.0.4 on 10.6.6 client), I cannot anyone to an event. I can add the email address, but it gets a little yellow exclamation point by it, the email doesn't go out and I get some errors in the console.

I don't really know where to look on the server for pertinent settings or logs. I'm using Kerberos v5 for auth (working fine) and the connection is over SSL on 8443. If it helps, I have set up a SRV record for iCal server pointing to my domain/port also.

the following messages show up in Console.app:

3/15/11 12:37:52 PM iCal[9807] CalDAV CalDAVLookupFreeBusyQueueableOperation failed: status 'HTTP/1.1 403 Forbidden' request:

BEGIN:VCALENDAR CALSCALE:GREGORIAN VERSION:2.0 METHOD:REQUEST PRODID:-//Apple Inc.//iCal 4.0.4//EN BEGIN:VFREEBUSY UID:A6BE2727-E7AA-4834-A1D0-634BF795EDBD DTEND:20110316T210000Z ATTENDEE:mailto:myemail@example.com DTSTART:20110316T200000Z X-CALENDARSERVER-MASK-UID:6CF7FE07-794A-4EAC-B23E-3608D2F78432 DTSTAMP:20110315T123751Z ORGANIZER:https://example.com:8443/principals/uids/wiki-mycalendar/ SUMMARY:Availability for mailto:myemail@example.com END:VFREEBUSY END:VCALENDAR

... response: HTTP/1.1 403 Forbidden Content-Length: 309 Server: Twisted/8.2.0 TwistedWeb/8.2.0 TwistedCalDAV/2.5 (iCal Server v12.58.7) Dav: 1, access-control, calendar-access, calendar-schedule, calendar-auto-schedule, calendar-availability, inbox-availability, calendar-proxy, calendarserver-private-events, calendarserver-private-comments, calendarserver-principal-property-search Date: Tue, 15 Mar 2011 19:37:52 GMT Content-Type: text/xml Www-Authenticate: negotiate YIGZBgkqhkiG9xIBAgICAG+BiTCBhqADAgEFoQMCAQ+iejB4oAMCARKicQRv4w1tJs/lOEZ39+lidHZwYUbrbvIv6FDjTSzt5LIF5/EpD7C6PCVg6Kju38wCqn+AVE1gd+irYUK1OJq3ccTasjigVVa+CQIsmSLfG7M/gtVdL7jh7n8+5o4uh5IHzrA3Ne1Xm4DntnwZHkL+ZX97

<?xml version='1.0' encoding='UTF-8'?><error xmlns='DAV:'>
    <schedule-send xmlns='urn:ietf:params:xml:ns:caldav'/>

3/15/11 12:37:52 PM iCal[9807] Error Error Domain=DAVErrorDomain Code=11 UserInfo=0x1156f8130 "The operation couldn’t be completed. (DAVErrorDomain error 11.)" getting free-busy information for ( "mailto:myemail@example.com" )

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