Issue with the connection to system GWP00001 client 500: Error when opening an RFC connection (CPIC-CALL: 'ThSAPOCMINIT' : cmRc=20 thRc=497

Dear SAP Experts,

I am Using Solution Manager 7.1

Need to generate 4 RFCs for my ECC production for Solution monitoring and EWA.

I am facing an error while generating RFCs for a Product System.

The SID is GWP

The Extended SID is GWP00001

Production Client is 500.

I have tried to create SM_GWP00001CLNT500_READ manually in sm59 an assign it to the prodution client and Check RFCs but no help.

While trying to generate RFC Destination from LMDB the following error is occuring

Issue with the connection to system GWP00001 client 500: Error when opening an RFC connection (CPIC-CALL: 'ThSAPOCMINIT' : cmRc=20 thRc=497 Unable to determine host address: ).

Attching the screen shot for you ref.

All the /etc/hosts and services are added with respective hostname and sapms<SID> in both the servers.Still facing the issue.

Please guide.I cannot setup the Solution Manager Functionality

Thanks in advance.

Asad