Error: HTTP 403.12 - Access Forbidden: Mapper Denied Access (248075)

SYMPTOMS

When connecting to Internet Information Services using a browser, you may receive the following error:

HTTP 403.12 - Access Forbidden: Mapper denied access

The page requires a valid client certificate
The page you are trying to view requires the use of a valid client certificate. Your client certificate map has been denied access to this Web site.

CAUSE

Generic 403 errors are returned when access to the content has been forbidden. The server is refusing to fulfill the request for content. This is generally not related to permissions.

Error 403.12 states that access to the content is not available and that the server requires a valid client certificate that has not been denied access.

The User ID mapped to the client certificate has been denied access to the resource.

RESOLUTION

To resolve this problem:

Check the effective date on the client certificate and ensure that the certificate is valid.
Check the expiration date and ensure that the certificate has not expired.
Check with the Certificate Authority that provided the certificate to see if your certificate has expired.
Verify that the certificate has not been explicitly denied access.

You can also resolve this problem by requesting a new certificate from the Certificate Authority (either a Certificate Authority on the Internet or the local Certificate Server) that the server requires.

For additional information on requesting a new certificate, click the article number below to view the article in the Microsoft Knowledge Base:

186812 Error: 403.7 Forbidden: Client Certificate Required