http://blogs.technet.com/jhoward/archive/2005/02/04/366883.aspxFollowing on from my post a couple of days ago about using MakeCert to generate a self-signed certificate, this is one way in which you can test that the generated certificate is working correctly for SSL authentication within IIS. It was almost worthyen-GBCommunityServer 2.1 SP1 (Build: 61025.2)http://blogs.technet.com/jhoward/archive/2005/02/04/366883.aspx#381834Tue, 01 Mar 2005 04:46:00 GMTd5e57398-b9ef-4490-9955-07cbb4e4a80d:381834Dave HermanI am able to create a test certificate with MakeCert, but it doesn't appear as an Assignable ceritificate in IS. Any idea what I might be missing? <br> <br>I am also looking for a step by step example on how to establish certificate authentication between a WebForm and and a WebService. I have tried creating a Cert using MakeCert, adding it to the certificate trust list on IIS and reading it into the the proxy on the Web Form client, but I keep getting the following error on the client side: &quot;The underlying connection was closed: Could not establish trust relationship with remote server.&quot; Any ideas? <br> <br> <br> <br> <br> <br>Thanks, <br>Dave