Migrating from ASP to ASP.NET

I am converting an ASP application to ASP.NET.the ASP application uses certificates for authentication.<br>I have installed IIS5.0 and .NET framework.The porblem is<br><br>Myweb app accesses another web app which is secure.<br> Authentication is one way between mu app and the secure app... i.e.<br>my app verifies that the secure-app is really "the" secure app !<br>(i have put the certificate under trusted root) <br> the application makes use of a COM component that sends the request to the<br>remote secure app over SSL. I get an "Invalid CA" when i send the request <br> The same set-up works for an ASP application. Same methods are invoked in the same sequence on the COM component fromboth ASP and ASP.NET applications.<br>both the applications (ASP and ASP.NET) are in the same virtual directory)..