Getting 401 when using client certificate with IIS 7.5

Question

I'm trying to configure a web site hosted under IIS 7.5 so that requests to a specific location require client certificate authentication. With my current setup, I still get a "401 - Unauthorized: Access is denied due to invalid credentials" when accessing the location with my client cert.

Here's the web.config fragment that sets things up:

<location path="MyWebService.asmx">
    <system.webServer>
      <security>
        <access sslFlags="Ssl, SslNegotiateCert"/>
        <authentication>
          <windowsAuthentication enabled="false"/>
          <anonymousAuthentication enabled="false"/>
          <digestAuthentication enabled="false"/>
          <basicAuthentication enabled="false"/>
          <iisClientCertificateMappingAuthentication enabled="true" oneToOneCertificateMappingsEnabled="true">
            <oneToOneMappings>
              <add enabled="true" certificate="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"/>
            </oneToOneMappings>
          </iisClientCertificateMappingAuthentication>
        </authentication>
      </security>
    </system.webServer>
</location>

The client certificate I'm using in my web browser matches what I've placed in the web.config. What am I doing wrong here?

Solution

I was getting the same error when i added the mappings at the application config. I saw this post http://blogs.msdn.com/b/rakkimk/archive/2009/07/08/iis7-configuring-iisclientcertificatemappingauthentication.aspx and moved my mapping entries to the website level and they get inherited by the application underneath and i only enabled IISClientCertificateAuthentication at the application level (disabled at the website level) and it started working.

Try moving the mappings to the configuration of the web site level and enable the client cert authentication at the application level. Good Luck and Happy New Year!