You are attempting to configure the Netmaster Webcenter interface using the Customizer Panels by updating the WEBCENTER parameter group. When you enter a port number in the Web Interface Port field and press enter you receive the following message:
BAIPWI20 zFS path name does not contain /nmInterface
This message doesn't appear to be documented and you have been unable to find any references on the support website.
There are several ways on the region itself: