IIS 7 404子状态代码清单：
| Status | Description |
| 404.1 | Site could not be found |
| 404.2 | Denied by Policy. The request ISAPI or CGI program is not allowed in the Restriction List. |
| 404.3 | The static file handler did not have the file in its MimeMap and therefore rejected the request. |
| 404.4 | No handler was found to serve the request. |
| 404.5 | The Request Filtering Module rejected an URL sequence in the request. |
| 404.6 | The Request Filtering Module denied the HTTP verb of the request. |
| 404.7 | The Request Filtering module rejected the file extension of the request. |
| 404.8 | The Request Filtering module rejected a particular URL segment (characters between two slashes). |
| 404.9 | IIS rejected to serve a hidden file. |
| 404.1 | The Request Filtering module rejected a header that was too long. |
| 404.11 | The Request Filtering module rejected a request that was double escaped. |
| 404.12 | The Request Filtering module rejected a request that contained high bit characters. |
| 404.13 | The Request Filtering module rejected a request that was too long (request + entity body). |
| 404.14 | The Request Filtering module rejected a request with a URL that was too long. |
| 404.15 | The Request Filtering module rejected a request with a too long query string. |
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