3099639 - System Replication setup error, unable to contact primary site host Trying old-style port

When trying to set up HANA System Replication between primary and secondary sites an error occurs on command line after executing 'sr_register....': 

nameserver <secondary host>:3##01 not responding.
collecting information ...
unable to contact primary site host <primary host>:4##02. internal error,location=<primary host>:4##02 . Trying old-style port (port offset +100)...<primary host>:4##02 
unable to contact primary site; to <primary host> :3##02; original error: internal error,location=<primary host> :3##02; 
failed. trace file nameserver_<secondary host>.00000.000.trc may contain more error details. 

Or when tried to register the Secondary site after take over using "sr_register", the registration failed with following error in secondary nameserver trace:

2023-03-14 12:30:36.557386 e TNS   TNSInfo.cpp(00583) : sendRequest dr_gethdbversion to <ip_address>:4##02 failed with NetException. data=(S)landscapeId=......
2023-03-14 12:30:36.560842 e TNS   TNSInfo.cpp(00583) : sendRequest dr_registerdatacenter to <ip_address>:4##02 failed with NetException. data=(S)hdbversion=2.00.0xx.00.....

SAP HANA, platform edition 2.0

NetException; register; enable_ssl; 40002; replication;  , KBA , HAN-DB-HA , SAP HANA High Availability (System Replication, DR, etc.) , Problem