Hi, Rick.
The most optimal way would be to use some GUI LDAP tool like **jxplorer**. You'll need to find an entry with objectclass `gluuAppliance` right after `ou=appliances` entry. Here you'll see attribute called `oxIDPAuthentication`. It contains json object with all authentication-related settings. You'll need to find ip/DNS name of your backend in it and change it to the new one.