title: Getting 401.2 when certificate authentication is enabled
body: <p>I'm setting up a server so that only mapped certificates can get to the webservice.  It is set to require SSL/Client certificates, anonymous authentication, asp.net impersonation, forms authentication, and windows authentication are all disabled.  One-to-one client certificate mapping is enabled, and certs are set up on the box with an appropriate user mapping.  When I try to use the webservice, I get 401.2.  If I enable anonymous authentication, it works, but I don't want any old cert to be able to access the website.</p>
  
  <p>I have another machine that has anonymous authentication disabled in this configuration, and it works.  I'm not sure what the difference is.</p>