Any way to change server IP remotely?

We have an urbackup instance with 200+ clients, I have made a mistake during configuration and set the Server Address as the instances public IP address. We need to change the ip address, but all of the clients are using the old public IP.
Is there any way to change the client ip settings remotely from the server? I wouldn’t like to have to go to every client one by one.
Currently there are 2 addresses on the server interface (the old and the new), the domain points to the new one.

Changing the server URL while agents can connect to the old URL will have them download the new server URL when they connect.

If you’ve already moved your server to the new URL and don’t have access to the old one I think it’s too late