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Best Way To Suppress Returned Http 403 Error Status Code



This guide has highlighted several possible reasons why an http 403 error status code might be returned. Next, I will provide you with several possible solutions that you can try to resolve this issue.

The response code for HTTP Error Status 403 Forbidden Client indicates that the server understood the request but refused to allow it. This state is similar to 401, but re-authentication is irrelevant in this case.



HTTP status code indicating that access to the resource is denied

HTTP 403 is an HTTP status code indicating that access to the requested resource is denied. The server understood the request, but cannot satisfy it due to a problem with the client. IIS defines non-standard “substate” error codes that provide a more specific reason for a 403 response.

Common HTTP Status Codes And Their Reasons

returning http error status code 403

The following table describes the reasons for some of the common HTTP status codes.


File extension


The request url is too long.

Code Description Notes
200 OK IIS 7.0 and later processed the request successfully.
304 No changes The client browser requests a document that is already in the cache and the document has not been modified since the document was cached. The client browser uses a cached copy of the document instead of downloading the document from the server.
400 Invalid Request Hypertext Transfer Protocol Stack File (Http.sys) is blocking IIS 7.0 and later from processing a request due to a request problem som. Typically, this HTTP status code indicates that the request contains invalid characters or sequences, or that the request conflicts with security settings in the Http.sys file.
401.1 Connection error The login attempt will most likely fail due to an invalid username or password.
401.2 Connection error due to server configuration This HTTP status code indicates a problem with the server’s authentication configuration settings.
401.3 Not allowed due to resource ACL This HTTP status code indicates a problem with NTFS file system permissions. This issue can also occur if the permissions on the file you are trying to access are correct. This problem occurs, for example, if the IUSR account does not have access to the C: Winnt System32 Inetsrv directory.
401.4 Filter authorization failed The Internet Server Application Programming Interface (ISAPI) filter does not process the request due to an authorization problem.
401.5 ISAPI / CGI Application Authentication FailedI was An ISAPI or Common Gateway Interface (CGI) application cannot process the request due to an authorization problem.
403.1 Access Denied An appropriate execute permission level was not granted.
403.2 Read access denied An appropriate level of read permission has not been granted. Make sure you have configured IIS 7.0 or later to grant read permission on the directory. Also, if you are using a standard document, make sure it exists.
403.3 Write access denied An appropriate write permission level has not been granted. Make sure IIS 7.0 and later permissions and NTFS file system permissions are set to grant write permission to the directory.
403.4 SSL Required The request is being made over an unsecured channel and the web application requires a Secure Sockets Layer (SSL) connection.
403.5 Requires SSL 128 The server is configured to use a 128-bit SSL connection. However, the request is not sent using a 128-bit ciphervania.
403.6 Denied IP Address The server is configured to deny access to the current IP address.
403.7 Client Certificate Required The server is configured to require a certificate for client authentication. However, the client browser does not have the corresponding client certificate installed. For more information, see HTTP Error 403.7 When Launching a Web Application Hosted on a Server Running IIS 7.0 .
403.8 Site Access Denied The server is configured to reject requests based on the Domain Name System (DNS) name of the client computer.
403.12 Mapper denies access The page you want to access requires a client certificate. However, the user ID associated with the client certificate has been denied access to the file.
403.13 Revoke Client Certificate The client browser is attempting to use a client certificate that has been revoked by the issuing CA.
403.14 Directory listing rejected The server is not configured to display a TOC list, anddefault document is undefined. See Section HTTP Error 403.14 – Forbidden When Opening IIS Webpage .
403.16 Client certificate not trusted or invalid. The client browser is trying to use a client certificate that the IIS 7.0 and later server does not trust or is invalid. For more information, see HTTP Error 403.16 When Trying to Access a Website Hosted on IIS 7.0 .
403.17 The client certificate has expired or is not yet valid. The client browser is trying to use an expired or not yet valid client certificate.
403.18 The requested URL could not be executed in the current application pool. A custom error page has been configured and the custom error page is in a different application pool than the requested application pool URL.
403.19 Client browser CGI applications in this application pool could not run. Application Pool Identity does not have the “Replace Token” right at the process level.
404.0 Not found. The file you are trying to access has been moved or does not exist.
404.2 ISAPI or CGI restriction. The requested ISAPI resource or the requested CGI resource has been restricted on the computer. For more information, see HTTP Error 404.2 when visiting a web page hosted on IIS 7.0 .
404.3 MIME type constraint. The current MIME mapping for the requested extension type is invalid or not configured.
404.4 Manager not configured. The requested URL filename extension does not have a handler configured to process the request on the web server.
404.5 Rejected by the request filtering configuration. The requested URL contains a string that was blocked by the server.
404.6 verb refused. The request is being made using an HTTP command that is not configured or is invalid.
404.7 rejected. The requested file name extension is not valid.
404.8 Hidden namespace. Requested URL rejected because the directory is hidden.
404.9 Hidden file attribute. The requested file is hidden.
404.10 The request header is too long. The request was denied because the request headers are too long.
404.11 The request contains a repeating escape sequence. The request contains a double escape sequence.
404.12 contains high order characters. The request contains high-order characters and the server is configured to not allow high-order characters.
404.13 Content length is too long. The request contains a Content-Length header. The Content-Length header exceeds the server’s valid limit. For more information, see HTTP Error 404.13 – CONTENT_LENGTH_TOO_LARGE when visiting a website hosted on a server running IIS 7.0 .
404.14 The requested URL exceeds the limit allowed by the server.
404,15 Query string too long. The request contains a query stringlonger than the limit allowed by the server.
404.17 Dynamic content associated with a static file manager. For more information, see Error message when visiting a website hosted in IIS 7.0: HTTP Error 404.17 – Not Found .
405.0 method not allowed. The request was made using an invalid HTTP method. For more information, see HTTP Error 405.0 When Visiting a Website.



When can I return my 403?

Thus, an unauthorized 401 response should be used for missing or failed authentication, and then a 403 forbidden response should be used if the user is authenticated but not authorized to perform the requested operation on the specified resource.

What causes a 403 error?

A 403 Forbidden error means that you do not have permission to view the requested file or resource. While sometimes this is done on purpose, sometimes it is due to incorrectly configured permissions. The main reasons for this error are permissions or.

What is the HTTP status code for bad request?

The response status code for an unsuccessful Hypertext Transfer Protocol (HTTP) request 400 indicates that the server cannot or does not want to process the request due to an error perceived as a client error (for example, invalid request syntax, invalid request message frame, or misleading request routing).