I am trying to install the server version of Trillian https://www.trillian.im/
for inter-office messaging, LAN only.
I am using Server 2012 Essentials. I can install but cannot start the Trillian Server. Their tech support said it is because their program uses port 443 and it is already being used. They, however, do not know how to fix this.
I found this page explaining the use of port 443 by Server 2012: http://blogs.technet.com/b/filecab/archive/2013/10/15/windows-server-2012-r2-resolving-port-conflict-with-iis-websites-and-work-folders.aspx
Apparently I can change the port from 443 to something else. But what else, like 444? I do not know much about ports.