"Server responded with an error"

[dballing]

Something changed recently -- I'm not entirely sure what -- but now, if I try to use iCal to make a change to my Zimbra calendars, I get:



I've tried completely deleting the calendar from iCal, and having the Zimbra Connector Preference pane recreate it. I've upgraded my Zimbra Connector to the latest version. In looking at my logs, I can see it trying to access it:

2010-03-21 03:00:44,764 INFO  [btpool0-0://zimbra.megacity.org/principals/users/dredd@megacity.org/] [ip=xx.xx.xx.xx;ua=DAVKit/4.0.1 (730);; CalendarStore/4.0.1 (973);; iCal/4.0.1 (1374);; Mac OS X/10.6.2 (10C540);] security - cmd=Auth; account=dredd@megacity.org; protocol=http_basic;
2010-03-21 03:00:45,208 INFO  [btpool0-0://zimbra.megacity.org/principals/users/] [ip=xx.xx.xx.xx;ua=DAVKit/4.0.1 (730);; CalendarStore/4.0.1 (973);; iCal/4.0.1 (1374);; Mac OS X/10.6.2 (10C540);] security - cmd=Auth; account=dredd@megacity.org; protocol=http_basic;
2010-03-21 03:00:50,439 INFO  [btpool0-0://zimbra.megacity.org/principals/users/dredd@megacity.org/] [ip=xx.xx.xx.xx;ua=DAVKit/4.0.1 (730);; CalendarStore/4.0.1 (973);; iCal/4.0.1 (1374);; Mac OS X/10.6.2 (10C540);] security - cmd=Auth; account=dredd@megacity.org; protocol=http_basic;

and I can see it get the 401 and then re-send a request with auth information:

74.64.94.169 -  -  [21/Mar/2010:07:00:44 +0000] "PROPFIND /principals/users/dredd@megacity.org/ HTTP/1.1" 401 0 "-" "DAVKit/4.0.1 (730); CalendarStore/4.0.1 (973); iCal/4.0.1 (1374); Mac OS X/10.6.2 (10C540)"
74.64.94.169 -  -  [21/Mar/2010:07:00:44 +0000] "PROPFIND /principals/users/dredd@megacity.org/ HTTP/1.1" 207 8432 "-" "DAVKit/4.0.1 (730); CalendarStore/4.0.1 (973); iCal/4.0.1 (1374); Mac OS X/10.6.2 (10C540)"

... so I'm not sure what's wrong.... anyone have any ideas?

More Info... I see it trying to update my specific calendar entry:

74.64.94.169 -  -  [21/Mar/2010:07:13:24 +0000] "PUT /dav/dredd@megacity.org/Calendar/e266065926039%40facebookcom.ics HTTP/1.1" 301 0 "-" "DAVKit/4.0.1 (730); CalendarStore/4.0.1 (973); iCal/4.0.1 (1374); Mac OS X/10.6.2 (10C540)"

But why on earth would the server be sending it a "301 moved permanently"?