400 The request cannot be resolved.
401.1 Unauthorized: Access is denied due to invalid credentials.
401.2 Unauthorized: Access is denied because the server configuration tends to use an alternate authentication method.
401.3 Unauthorized: Access is denied because the ACL is set on the requested resource.
401.4 Unauthorized: The filter authorization failed to install on the WEB server.
401.5 Unauthorized: ISAPI/CGI application authorization failed.
401.7 Unauthorized: Access is denied because of a URL authorization policy on the WEB server.
403 Forbidden Access: Access is denied.
403.1 Forbidden: Execution access is denied.
403.2 Forbidden: Read access is denied.
403.3 Forbidden: Write access is denied.
403.4 Forbidden: You need to view the resource using SSL.
403.5 Forbidden: You need to use SSL 128 to view the resource.
403.6 Forbidden: The IP address of the client is denied.
403.7 Forbidden: SSL client certificate required.
403.8 Forbidden: The DNS name of the client is denied.
403.9 Forbidden: Too many clients try to connect to the WEB server.
403.10 Forbidden: The WEB server is configured to deny execution access.
403.11 Forbidden: The password has changed.
403.12 Forbidden: The server certificate mapper denied client certificate access.
403.13 Forbidden: The client certificate has been revoked on the WEB server.
403.14 Forbidden: The directory list has been rejected on the WEB server.
403.15 Forbidden: The WEB server has exceeded the Client Access License limit.
403.16 Forbidden: The client certificate is malformed or not trusted by the WEB server.
403.17 Forbidden: The client certificate has expired or is not yet valid.
403.18 Forbidden: Unable to execute the requested URL in the current application pool.
403.19 Forbidden: The CGI cannot be executed for the client in this application pool.
403.20 Forbidden: Passport Login failed.
404 file or directory not found.
404.1 file or directory not found: The Web site cannot be accessed on the requested port.
Note The 404.1 error only appears on computers that have multiple IP addresses. If a client request is received on a particular IP address/port combination and the IP address is not configured to listen on that particular port, IIS returns a 404.1 HTTP error. For example, if a computer has two IP addresses and only one of the IP addresses is configured to listen on port 80, any requests received from port 80 by another IP address will cause IIS to return a 404.1 error. This error should only be set at this service level, because it is returned to the client only if multiple IP addresses are used on the server.
404.2 the file or directory could not be found: The lock policy prohibits the request.
404.3 the file or directory could not be found: the MIME mapping policy prohibits the request.
405 The HTTP action used to access the page is not licensed.
406 The client browser does not accept the MIME type of the requested page.
The 407 WEB server requires initial proxy authentication.
410 file has been deleted.
412 The prerequisites for client settings fail when evaluated on the WEB server.
414 The request URL is too large, so the URL is not accepted on the WEB server.
500 Server Internal error.
500.11 Server Error: The application on the WEB server is shutting down.
500.12 Server Error: The application on the WEB server is restarting.
500.13 Server Error: The WEB server is too busy.
500.14 Server Error: Invalid application configuration on the server.
500.15 Server error: Direct request for GLOBAL is not allowed. Asa.
500.16 Server Error: UNC authorization credentials are incorrect.
500.17 Server Error: The URL authorization store could not be found.
500.18 Server Error: The URL authorization store cannot be opened.
500.19 Server Error: The file's data is not configured correctly in the configuration database.
500.20 Server Error: The URL authorization domain could not be found.
500 100 Internal Server error: ASP error.
501 The configuration specified by the caption value is not executed.
An invalid response was received by the 502 Web server as a gateway or proxy server.
HTTP Common error Codes
