I've had a calendar server running happily for years with no problems. Recently - since restoring my virtual server - it has stopped working. In the error.log I get lots of 2013-03-03 22:30:05+0000 [-] [caldav-8008] [HTTPChannel,55,82.0.114.204] PROPFIND /calendars/__uids__/2e8f93bb-353d-50f1-a24a-3471395786cc/inbox/ HTTP/1.1 but I don't think that's anything unusual. However whenever I try to change something in a calendar - that should write to the server - the logs will say something like: [-] [caldav-8008] [HTTPChannel,68,82.0.114.204] PUT /calendars/__uids__/2e8f93bb-353d-50f1-a24a-3471395786cc/5AD40E77-ED61-4D6D-BDBD-735EAF0A3723/2791CEAB-F641-41DA-B78B-D5B02C70E77A.ics HTTP/1.1 [-] [caldav-8008] [HTTPChannel,69,82.0.114.204] PUT /calendars/__uids__/2e8f93bb-353d-50f1-a24a-3471395786cc/5AD40E77-ED61-4D6D-BDBD-735EAF0A3723/2791CEAB-F641-41DA-B78B-D5B02C70E77A.ics HTTP/1.1 [-] [caldav-8008] [HTTPChannel,69,82.0.114.204] Writing request stream to /var/spool/caldavd/calendars/__uids__/2e8f93bb-353d-50f1-a24a-3471395786cc/5AD40E77-ED61-4D6D-BDBD-735EAF0A3723/2791CEAB-F641-41DA-B78B-D5B02C70E77A.ics [-] [caldav-8008] [HTTPChannel,69,82.0.114.204] Writing to file /var/spool/caldavd/calendars/__uids__/2e8f93bb-353d-50f1-a24a-3471395786cc/5AD40E77-ED61-4D6D-BDBD-735EAF0A3723/2791CEAB-F641-41DA-B78B-D5B02C70E77A.ics [-] [caldav-8008] [-] 'Rollback: commit' [-] [caldav-8008] [-] 'Rollback: removed destination backup /var/spool/caldavd/calendars/__uids__/2e8f93bb-353d-50f1-a24a-3471395786cc/5AD40E77-ED61-4D6D-BDBD-735EAF0A3723/2791CEAB-F641-41DA-B78B-D5B02C70E77A.ics.rollback' Is that normal? Is it possible I have fallen foul of some user id number issue when restoring the server, that's affecting file permissions? The Calendar on Mac OS X clients are not reporting any issues; they seem to think that everything is fine and that the server has saved their events, but none of the events appear on the other clients. The iCal client on a machine running Leopard has obviously not saved any of its events locally, because its calendar is completely empty now. Thanks for any help. Daniele -- Daniele Procida Web Officer Cardiff University School of Medicine Tel.: +44 29 2074 2144