What's Changed - IIS 7 Status Codes
Besides the standard IIS Status code you can find in this KB. You will find the follow new status codes been introduce with IIS 7.
New -
404.4 - File or directory not found: No module handler is registered to handle the request.
404.5 - URL sequence denied. The specified URL sequence is not accepted by the server.
404.6 - HTTP verb denied. The specified HTTP verb is not accepted by the server.
404.7 - File extension denied. The specified file extension of the resource is not accepted by the server.
404.8 - URL namespace hidden. The namespace of the specified URL is hidden by configuration.
404.9 - File attribute hidden. The requested file has a hidden attribute which prevents it from being served.
404.10 - Request header too long. One of the request headers is longer than the specified limit configured in the server.
404.11 - URL is double-escaped. This URL is denied because it is susceptible to double-escaping attacks.
404.12 - URL has high bit characters. This URL is denied because it has high-bit characters.
404.13 - Content-Length too large. This URL is denied because the Content-Length set is longer than specified by configuration.
404.14 - URL too long. This URL is denied because its length is longer than specified by configuration.
404.15 - Query-String too long. This URL is denied because its Query-String is longer than specified by configuration.
As you may noticed, lot of new 404 entries. 404.13/.14 replaced the 413/414 status codes and re-category under 404.
500.14 - Server error: Invalid application configuration on the server.
500.17 - Server error: URL authorization store cannot be found.
500.19 - Server error: Data for this file is configured improperly in the configuration store.
Removed -
403.20 - Passport logon failed. This error code is specific to IIS 6.0.
As Passport Login support has been removed from IIS 7.0
Duplicate -
405 - HTTP verb used to access this page is not allowed.
Not sure what's the difference with 404.6 :)
Unknown -
401.6 - Unauthorized: URL authorization scope was not found on the server.
401.7 – Access denied by URL authorization policy on the Web server. This error code is specific to IIS 6.0
407 - Proxy authentication required.
410 - File has been removed.
415 – Unsupported media type.
500.11 - Server shutting down
500.12 - Application is busy restarting on the Web server
Not sure if these still supported...
Let me know if you found any new status code...