I changed the IP of my test server, I used the modify db command. I then connected to NS and updated gateway and dns etc, and it all seem to work ok.
The connection to my Zentyal AD seemed to be broken, so I unbinded, and updated the Accounts Provider to connect to Zentyal again (Zentyal's IP changed as well), and it connected OK.
So, now everything on NS seems to work, and NextCloud works, but WebTop does not, it is not getting the users from Zentyal. These are all in a VM, so I was able to restore snapshots and try to do stuff in different orders, but nothing works, WebTop does not get any users from Nethserver/Zentyal.
The last attempt, I unbinded from Zentyal AD, then changed NS IP, uninstalled WebTop, updated all DNS/Gateway, etc on NS, reconnected to Zentyal using Accounts provider in NS, reinstalled WebTop, and still nothing.
Is there something in WebTop that is still looking at old IP?