I\'m using .Net Open ID (http://code.google.com/p/dotnetopenid/)
I\'m trying to add OpenId to a website we are using. I\'m running the MVC sample out of the box and
First, check to make sure that Request.Form["openid_identifier"] is returning a valid URL (either the openid path to yahoo or google). If it's not then you have an issue with your openid selector. If it is, then the request is being made, but the openid provider isn't responding in time which causes you to get the "No OpenID endpoint found." Try issuing the request again and see if it works a second subsequent time.
UPDATE
If you're running under a proxy you need to specify that
Example:
<defaultProxy useDefaultCredentials="true">
<proxy autoDetect="True" usesystemdefault="True"/>
</defaultProxy>