• A first digit of 1, 2, or 3 represents a fully functional request. More information about these codes can be found in this article.

500 Internal Server Error

509 Bandwidth Limit Exceeded

<-- 

 Set PAGETITLE =  HTTP Error Codes and Quick Fixes
 
-->

• A first digit of 1, 2, or 3 represents a fully functional request. Information about these codes can be found here.
• A first digit of 4 represents a client-side error. The most common codes span 400 to 404.

4xx Errors

Although these errors are technically the result of a problem with the client's (ie, the browser's) request, oftentimes they point to a problem on a website. For example, if you have a faulty link on your home page, and visitors click it, they may see a 404 error.

For this reason, it's important to monitor these errors and investigate their causes. Since these are also among the highest-profile codes (visitors see them the most), you may want to customize your Error Pages for them in cPanel.

400 Bad Request

The user’s request contains incorrect syntax.

401 Unauthorized

The requested file requires authentication (a username 
and password).

403 Forbidden

The server will not allow the visitor to access the requested file. If a visitor sees this code in error, check the file's permission settings. You can also check to see whether the file has been protected via cPanel's Index Manager.

404 Not Found

The server could not find the file that the visitor requested. This error commonly occurs when a URL is mistyped.

5xx Errors

These errors are caused by the server being unable to fulfill an apparently valid request from a visitor. Often, you will need the help of a server administrator in order to investigate these errors.

It is also important to consider that many times, a chain of servers is handling an HTTP request, so that it may not be the actual web server that is returning the error.

500 Internal Server Error

501 Not Implemented

502 Bad Gateway

503 Service Unavailable

504 Gateway Timeout

505 HTTP Version Not Supported

506 Variant Also Negotiates

507 Insufficient Storage

509 Bandwidth Limit Exceeded

510 Not Extended

HTTP Error Codes and Quick Fixes

There are five classes of HTTP codes, divided into categories by the first digit.

• A first digit of 1, 2, or 3 represents a fully functional request.
• A first digit of 4 or 5 represents errors. As 4XX relates to client-side errors, they will not be covered here.
• A first digit of 5 represents a server-side error. Common codes span 500 to 510.

It is important to consider that many times a chain of servers is handling an HTTP request, so that it may not be the actual web server that is returning the error.

The first step in resolving the issue is to clear the client’s cache. This action should result in the a different proxy being used to resolve the web server’s content.

Contact the server administrator if this problem persists for an inappropriate amount of time.

To resolve this issue, contact the system administrator.

This error will not be an issue with a current installation of cPanel.

To resolve the issue, the server’s hard disk may need to be cleaned of any unnecessary documents to free up more hard disk space, its memory may need to be expanded, or it may simply need to be restarted.

Please contact the system administrator for more information regarding this error message.

Consult the system administrator for information about acquiring more bandwidth.

To resolve the issue, you may need to update the server. Please consult the system administrator for more information.

Http Error Codes and Quick Fixes

Http codes describe the status of a URI when it is accessed. The codes are three digit numbers that relay the server’s response to the visitor’s request. There are five classes of http codes that are divided into categories by the first digit they contain. A first digit of 1, 2, or 3 represents a fully functional request. A first digit of 4 or 5 represent errors. As 4XX relates to client-side errors, they will not be covered in the manual. Server side errors are represented by the first digit in the sequence being 5. Common codes span 500 to 510. It is important to consider that many times a chain of servers are handling an http request and that it may not be the actual web server that is returning the error.

500 Internal Server Error

This error signifies that the server has encountered an unexpected condition. This error is a “catch-all” error that will be displayed when no specific information can be gathered by the server regarding this condition. This error often occurs when an application request cannot be fulfilled due to the application being misconfigured.

501 Not Implemented

This signifies that the HTTP method sent by the client is not supported by the server. It is most often caused by the server being out of date. This error is very rare and will generally requires that the web server be updated.

502 Bad Gateway

This error is usually due to improperly configured proxy servers. However, the problem may also arise when there is poor IP communication amongst back-end computers, when the client’s ISP being overloaded, or when a fire wall is improperly functioning. The first step in resolving the issue is to clear the client’s computer cache. This action should result in the a different proxy being used to resolve the web server’s content.

503 Service Unavailable

This error occurs when the server is unable to handle requests due to a temporary overload or due to the server being temporarily closed for maintenance. The error signifies that the server will only temporarily be closed. It is possible to receive other errors in place of 503. Contact the system operators if the problem persists for an inappropriate amount of time.

504 Gateway Timeout

This occurs when a server, somewhere along the chain, does not receive a timely response from a server further up the chain. The problem is caused entirely by slow communication between up-stream computers. To resolve this issue contact the system operator.

505 HTTP Version Not Supported

This error occurs when the server refuses to support the HTTP protocol that has been specified by the client computer. It can be caused by the protocol not being specified properly by the client computer, for example if an invalid version number has been specified. This error will not be an issue with a current installation of cPanel.

506 Variant Also Negotiates

This error indicates that the server is not properly configured. Please contact the system operator to resolve this issue.

507 Insufficient Storage

This code indicates that the server is out of free memory. It most likely occurs when an application being requested cannot allocate the necessary system resources for it to run. To resolve the issue the server’s hard disk may need to be cleaned of any unnecessary documents to free up more hard disk space. Its memory may need to be expanded or it may simply need to be restarted. Please contact the system operator for more information regarding this error message.

509 Bandwidth Limit Exceeded

This error occurs when the bandwidth limit imposed by the system operator has been reached. The only fix for this issue is to wait until the limit is reset in the following cycle. Consult the system operator for information about acquiring more bandwidth.

510 Not Extended

This error occurs when an extension attached to the HTTP request is not supported by the web server. To resolve the issue it may be necessary to update the server. Please consult the system operator for more information.