We had to recently change our network and assign new IP addresses to our machines. The machine that runs our CatDV server software received a new static IP address as a part of this.
The IP address was changed in the Server config and appears there correctly.
The problem we encounter is that if the server Control Panel is restarted, it pulls the old IP address from some pref file and then fails to connect. The IP address in the server config remains correct and when the server config is resaved, CatDV starts looking at the correct IP address and then works properly.
We can't locate a pref file for the server software to see if we can change it.
Long boring explanation: the IP address that the control panel uses is stored separately (using a built-in Java preferences mechanism) from the /usr/local/catdv/catdv.properties setting which the CatDV Server uses. (Theoretically you could use the control panel to administer a server on a different machine, though this has never been fully implemented.) Normally they are both the same but it sounds like in your case they've got out of synch.
Go into the Installation panel (not the normal Server Config window) and enter the IP address there and that should resolve the issue.