3426564 - AO Excel Plugin: connection for AO is not working

• AO is showing "Error while checking availability of SAP BusinessObjects BI platform system" when entering the webservice url and not allowing the user to access the AO.
• Issue seen after upgrade from SAP BusinessObjects BI platform 4.2 SP7 Patch to 4.3 SP 3 
• Issue seen with both HTTP and HTTPS urls.
• From scripted test tool [KBA SAP KBA 3338843 ] Connection tests fail with errors like
  “The system could not connect to the remote system at URI http://fqdn..:8080/services/Session/. This error occurred: “error 111 – Connection refused (Connection refused) (local port NNNNN to address N.N.N.N(fqdn), remote port 8080 to address N.N.N.N(fqdn))”
• from KBA dswsbobje tester tool returns errors
  " Unable to determine IP address from host name FQDN"
  "The DNS server returned:"
  "Name Error: The domain name does not exist."
• Tomcat logs where dswsbobje is deployed show similar entries like  -
   Line 513982: [DEBUG] Fri Jan 12 16:26:24 EST 2024 jcsi.kerberos: Failure from UDP attempt #0 to DNS server FQDN/N.N.N.N-- java.net.SocketTimeoutException: Receive timed out (local port 12094 to address 0.0.0.0, remote host unknown)
  
   

SAP BusinessObjects BI platform 4.3 SP3
SAP Analysis Office 2.8+
Linux

BI 4.3 AO 2.8 upgrade connect BIP  , KBA , BI-BIP-DEP , Webapp Deployment, Networking, Vulnerabilities, Webservices , BI-RA-AO-BIP , AO Precalculation, Scheduling and AO InfoOb... , Problem