I have a CME/CUE and had to change the IP address for both. I also had to change the extension range I was using.
However, now I get strange behavior. Whenever I click on the users the web page never shows the users - it just stays in loading mode. I can fix this by re-entering the admin login/password but that only works for a day and the issue happens again. Also, I noticed the old extensions keep coming back even after saves and reloads.