Cannot log into GroupWise Admin Service on one POA

Having trouble with one POA, out of a system with multiple POA's and agents. This started when working to move the system IP addresses to host names in preparation for upgrade. 

the gwadmin-console.log states: 

2024-08-15 09:49:55 RestService [ERROR] GET->https://<hostname>:9710/gwadmin-service/system/whoami failed
2024-08-15 09:49:55 RestService [ERROR] Caught IOException - Premature EOF
2024-08-15 09:49:55 GwAuthenticationProvider [ERROR] ***Failed to Login **** Premature EOF

No admin users can login. I've re-run the installation, I have used gwadminutility to get new certificates, but I can't seem to get into it at all. 

It does seem to be communicating to the Primary domain, because user changes are happening. 

anyone have any ideas how to address this?