OK, So i have now tried http://ip.of.server:8103/inform and it comes through to the unifi controller on the remote server but instead of adopting as it should it shows inform error. when doing SSH - "info" on AP i can see that it says "Server Reject (http://ip.of.server:8103/inform)". So i think i now have the correct port but its not getting through fully!? would anybody be able to help with this?
Sorted it! I had to forget the device on my current controller (resetting the device) and forget it on the new controller. I then manually informed the new controller and then it was able to adopt! network back up and running and controlled by the remote server