There are two CDA nodes upgraded from 12.2 to 12.3 . Each one are working fine. The second node does not register the restendpoint correctly in the MQSRV table (MQSRV_RestEndpoint = 'NULL').
In the production environment this is working correctly (v12.2): the first node has the value http://domaine:8088 and the second http://server.fqdn:8088 in the MQSRV_RestEndpoint.
The difference found between the tow is the MQSET =2 in production and 1 in the validation (v12.3).
If I address the second node directly on the awi I get the following error: com.uc4.ecc.backends.exceptions.AutomationEngineAPIException: Error during XRequest com.uc4.communication.requests.GetRestEndpoints
The processes are running on both servers:
Release : 12.3
Make sure that HOSTNAME variable on both nodes ucsrv.ini file is correct with Fully Qualified Domain Name.