14 Replies Latest reply: Jul 25, 2014 1:05 PM by eggfooyang
macuser1967 Level 1 Level 1

I upgraded one of my Macs to OS X Mountain Lion. Today, I found out, that iCal communication has changed. I cannot enter nor modify calendar entries which are hosted on a Zimbra server (Zimbra Community Edition 7.2.0) and accessed through the CalDAV protocol. - The same calendar can be updated from a 10.7 OS X Client without any problem for the same account.


So it seems that Mountain Lion changed the way of its communication to CalDAV servers. I get the following error message in iCal: The server responded with “400” to operation CalDAVWriteEntityQueueableOperation.


I did not expect iCal to become broken through the Mountain Lion upgrade... - Any idea if this can be fixed?

Mac mini (Mid 2011), OS X Mountain Lion
Solved by macuser1967 on Jul 26, 2012 2:25 PM Solved

Cool - this works. Thanks for the work around!

Reply by eywleung on Jul 26, 2012 12:54 PM Helpful

It's to do with the Default Alarm setting. There is a bug that does not allow "Alert" to be set to "None".


To temporarily solve this bug, set the default alarm for that account to anything other than "None". And also, don't change alert setting of any existing event to None.

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