SSL certification in Receiver REST Adapter

Hi,

We are using SSL certificate in PI for IDOC to REST scenarion as Server expect a certificate from Client.We have a installed certificate in PI and created PFX certificate.

Getting below error in the communication channel monitoring,

HttpCallException: HTTP POST call to https://xxxx not successful. HTTP/1.1 500 Internal Server Error

Any inputs would be helpful.

Cheers,

Giri