MSPKI Certificate 'Please choose a certificate' - empty

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webservice

SSL

TLS

I need to consume a webservice of a partner server from my server(Win 2003). I created a MS PKI certificate and installed in my server, and shared with partners as will. They also imported our certificate in their server.

But when i try to check the working of webservice from Internet Explorer itself(by directly going to the webservice URL), a pop up comes showing "Choose a digital certificate", but the list is empty.

Not sure why this coming.

If any one knows about this, please share asap. [And I am new to webservice/web based apps/Security Certifications]