Zimbra + CalDAV + Outlook = Error 403

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alien2108
Posts: 3
Joined: Sat Sep 13, 2014 3:22 am

Zimbra + CalDAV + Outlook = Error 403

Postby alien2108 » Fri Apr 21, 2017 8:27 am

Hey All!

We are using Zimbra 8.7.1GA1670 with Outlook CalDav Synchroniser to do sync of the Calendars over CalDAV. I did notice that Sync fails suddenly for some users with shared calendars with the following error in Zimbra:

dav - sending http error 403 because: Changing ORGANIZER of an appointment is not allowed: old='user@xxx.xx' new='new_user@xxxx.xx'

Now new_users@ has full access rights granted to the calendar of user@. I am not really sure why Organizer is being changed, but can I tell Zimbra somehow to allow that, since the user has full access rights anyhow?

I did notice a couple of other users had same issue in the past, bot no useful answer was found.


lethargos
Posts: 19
Joined: Thu Oct 20, 2016 12:32 pm

Re: Zimbra + CalDAV + Outlook = Error 403

Postby lethargos » Fri Aug 18, 2017 12:09 pm

Don't kid yourself. This forum is dead. If you don't pay for the commercial version, you kind of... don't matter :) I'd opt for a classical postfix/dovecot/amavis/spamassassin/clamd/roundcube whatever e-mail setup.
alien2108
Posts: 3
Joined: Sat Sep 13, 2014 3:22 am

Re: Zimbra + CalDAV + Outlook = Error 403

Postby alien2108 » Fri Aug 18, 2017 1:33 pm

Yeah...sadly I see exactly that....
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Gren Elliot
Zimbra Employee
Zimbra Employee
Posts: 183
Joined: Tue Jun 10, 2014 4:45 am

Re: Zimbra + CalDAV + Outlook = Error 403

Postby Gren Elliot » Fri Aug 18, 2017 1:54 pm

ORGANIZER changes are disallowed for 2 reasons
  • The calendaring standards don't allow it. (The correct method is to cancel the meeting and get the new ORGANIZER to create a new one)
  • In the past, bugs in calendaring clients combined with us allowing ORGANIZER changes have caused total havoc as ATTENDEEs hijacked the meeting to be their own, causing responses to be re-routed to the wrong user who wasn't expecting it.
yeeP6rai
Posts: 40
Joined: Mon Feb 12, 2018 10:16 am

Re: Zimbra + CalDAV + Outlook = Error 403

Postby yeeP6rai » Tue Feb 11, 2020 9:19 am

Workaround

Code: Select all

cat /opt/zimbra/log/mailbox.log|grep username|grep "dav - sending http error"


you will see url of .ics

download it (from username) and open by text editor. Find the name ("SUMMARY:" field) of the calendar event and delete it from calendar. Issue solved
Lewis-H
Posts: 49
Joined: Wed Jan 01, 2020 11:28 am
Contact:

Re: Zimbra + CalDAV + Outlook = Error 403

Postby Lewis-H » Tue Feb 11, 2020 1:57 pm

What CalDAV server are you using? Can you check the server logs if there is any error? 403 just means the server blocks access for some reason.
Maybe you have no right to set the organizer and and you have to deactivate the MappingOption "Map Organizer and Attendees".

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