GroupWise 2014 R2 Support Pack 2
When any user publishes their calendar they cannot go to a browser and see the published calendar. The browser error is :
"The requested calendar data is unavailable. Please try again later"
It was discovered that the Post Offices agent objects as listed in the GroupWise Web Admin console, had expired SSL certificates. Once they were regenerated then this problem went away.
The calendar publishing host was configured to use an SSL Port and could not communicate with the POA when the certificate was expired.