Dear list,

we are running an OSX lion server and using caldav on it. 

Server:
        System Version: 10.7.4 (Build 11E53)
        Kernel: Darwin 11.4.0
        Services: Mail, Open Directory, iCal

Clients are running OSX 10.7.x and 10.8.x

We had problems in the past with errors when refreshing calendars. It happened 
often that an error message 500 was shown when refreshing, especially if the 
user had more calendar delegations
configured. After a long journey with the the apple support a workaround was 
mentioned to change the port from 'auto' to '8443' in the server settings for 
iCal on the client machines. We also changed the
refresh rate for calendars from push to a fixed value. It seems that these 
changes solved the problems with the 500 error. 

Now we are facing a new error when receiving calendar invites as a attached ics 
file, mainly from outside our organization. When opening the attached ics file, 
an error 403 is shown and it is not possible to 
accept the invite. Contacting Apple support again was not successful because 
they are saying it is a different error and we need to purchase a new support 
case to get help from them. 

So the question is, can anybody give us a hint on how to solve these issue? 
Maybe someone already has a fix or a workaround for this error? 
If you need any further information, please let me know. 

Any help would be appreciated. 

Best Regards
Frank 

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