HTTPS Messaging with Client Side Certificate fails with IIS error 403

SymptomsWe have a Win2k3/Win2k8 Server. We are trying to send HTTPS messages to this Win2k3 Server. The Server Requires Client Side Certificates. The IIS log shows error 403.7 - Client Side Certs Reqd. Also if you enable deadlettering on the messages the messages end up in deadletter queue with HTTP error 403. CauseIf a Win2k8 Server has this problem then the problem is that the Network Service