We have a Jira installation running with the Jira Calendar Plugin loaded. It can export in ical format from the portlet. I have no problems subscribing to the export in osx ical.
Now when i subscribe to the export in Zimbra nothing shows up in the webclient. But the weird thing (i find it weird anyway) is the caldav subscription in my osx ical does work fine
I have no idea where to look to track this problem... Any ideas?