Calling HTTPS REST services from Appian: Do we need to give reference of the Client certificate in the REST service call

Hi,

I need to call HTTPS Rest service from Appian for which I have received the client certificate from the external system and I have uploaded the same in Appian through 'Admin console'->'Client Certificates'. After uploading the certificate, do I need to give any reference of the certificate in the REST service calls which am making from Appian? or will the REST service automatically refer the certificate which is uploaded?

I tried firing the REST service from Appian without passing any refernce of the Client certificate which is uploaded and getting the below error,

message: "Failed to connect to 13.92.186.254:9443/.../token" detail: "sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target"

Regards,

Balaji.R