If the host name or the system number of the SAP system serving as the domain controller changes, you have to set the new address of the domain controller on all SAP systems in the transport domain.
Outside the domain controller, you can only change the RFC address of the domain controller.
Avoid these manual actions by configuring a backup controller and activating it before changing the domain controller.
To change the address of the domain controller:
Repeat this process for all the other SAP systems in the transport domain.