RFC failing with SNC enabled option

Hello Experts ,

RFC from CRM --> ERP is failing when i enable SNC , error is indicated below :

"Connection closed(no data)" -

After exchangin the certifcates i get different erro :

"When executing a remote function call , an error occured"

I checked the dev_rfc but no information.

Steps i carried are as followed :

1. SNC name of ERP in CRM RFC.
2. SNC name of CRM in ERP in SNC0 (Tx).

Please let me know if i missing something.

Thanks
Dev