SSL Client with 2-way authentication problem

I am using NET+OS 7.4 with all the latest patches on a ConnectME-C. I am using the basic sample application (SSL V3-TLS V1) to test out connecting it to IIS server or OpenSSL Server.

We I try to use both server and client certificates (2-way authentication), it looks like the SSL library in NET+OS does not support renegotiation, which is a needed/mandatory requirement in order to authenticate to IIS.

Has anyone had any luck getting 2-way certificates to work with IIS, or re-configuring NET+OS ssl library to support re-negotiations or other parameters.