Hello,
This IP address cannot be deleted and must be configured.
When the device interacts with the controller, the address of the URL in the URL template is first parsed. Then, when the device receives the authentication packet from the Controller, it will query the server-IP for the existence of the IP of the portal server. The device will not process the message from Agile Controller if IP does not exist in the Configuration of server-IP.
Therefore, when there are multiple portal servers, all the portal server addresses need to be configured in the early server-IP.
Hope to help you!