After updating from GW 18.3.1 to 18.4.1, the Calendar Publishing Host is not working anymore.
When accessing, http://calpubhost_server/gwcal/calendar, receive the following error:
(The server or post office agent is no longer responding or has become disconnected. Contact your system administrator.)
Locate the calhost.cfg file in the /var/opt/novell/groupwise/calhost folder.
Verify that the IP Address and Port number are correct under the Default Post Office definitions section: