Hi Venkata - It may be that the IS doesn’t recognize the other party’s Certificate Authority (CA) cert. Make sure both parties have the other party’s CA cert (e.g. VeriSign) installed in their respective CA certs dir (which is also sometimes referred to as a “truststore”).
On the wM side, we need to load the other party’s CA cert in a directory (e.g. “…/IntegrationServer/trustedCerts”) and map the to that directory in the IS Admin UI.
#Integration-Server-and-ESB#webmethods-Protocol-and-Transport#webMethods