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Common Internet Error Codes

Here are the most common codes and messages you're likely to see on your Web browser (HTTP), when accessing Usenet, using e-mail, or using the FTP protocol to upload or download files.

The codes can generally by grouped as follows -

  • 100-199 - Information Codes. Provide information about the request or the servers involved.
  • 200-299 - Success Codes. Indicate that the request was accepted or the requested file has no content (empty).
  • 300-399 - Redirects. Requested content has moved.
  • 400-499 - Client Errors. Cannot find content or you don't have the correct permissions to access it.
  • 500-599 - Server Errors. There is a problem at the server end stopping the request from completing successfully.
Code   TitleDescription
101Switching Protocols 
200OKThe request was successful
201CreatedThe request was successful and a new resource was created
202AcceptedThe request was accepted for processing, but the processing is not yet complete
203Non-Authoritative Information 
204No ContentThe server has processed the request but there is no new information to be returned
205Reset Content 
206Partial Content 
300Multiple ChoicesThe requested resource is available at one or more locations
301Moved PermanentlyThe requested resource has been assigned a new URL and any further references should use this new URL
302Moved TemporarilyThe requested resource resides at a different location, but will return to this location in the future
303See Other 
304Not ModifiedThe requested resource has not been modified since the date specified in the If-Modified_Since header
305Use Proxy 
400Bad RequestThe server could not properly interpret the request. Normally means that either address hasn't been entered correctly or the page no longer exists.
401UnauthorisedThe site being accessed is protected and you either entered the incorrect password or the host does not want users coming from your domain to enter.
402Payment Required 
403ForbiddenYou are not permitted to access this document. It is either password-protected or the host does not want your domain to enter.
404Not FoundThe host server can't find the HTML document at the URL you've entered. Either you have mistyped the URL, the document no longer exists, or you've been given the wrong URL.
405Method Not Allowed 
406Not Acceptable 
407Proxy Authentication Required  
408Request Time-Out 
411Length Required  
412Precondition Failed 
413Request Entity Too Large 
414Request-URL Too Large 
415Unsupported Media Type 
500Internal Server ErrorThe server could not satisfy the request due to an internal error condition.
501Not Implemented 
502Bad GatewayThe server received an invalid response from the server from which it was trying to retrieve information.
503Out of Resources 
504Gateway Time-Out 
505HTTP Version not supported 
 Bad File RequestThe form you're trying to access is not supported by your browser or there is an error in the form.
 Cannot Add Form Submission Result to Bookmark ListOccurs when you've submitted a search request and then try to save the result as a bookmark. Even though it may look like a valid address, the resulting page does not have a URL that can be reused so it can't be added to your bookmark list.
 Connection Refused by HostYou're not permitted to access this document either because it's password-protected or the host doesn't permit your domain to enter.
 Failed DNS LookupThe URL you requested could not be translated into a valid Internet address by the domain name system. This is either a result of a mistake in the system or you could have mistakenly entered an incorrect URL
 File Contains no DataThe site you accessed doesn't contain any Web pages on it.
 Helper Application not FoundYou're trying to load a file of a type that your browser doesn't recognise
 Host UnavailableThe server computer that hosts this site could not be reached. The server may be offline or down for maintenance
 Host UnknownThe server you're trying to reach is not connected, or you have lost your own connection. You may have also entered the URL incorrectly.
 Network Connection was Refused by the ServerSome servers have limits on the number of people or request they can handle at a time. If you get this message, the server is probably too busy to handle one more user.
 NNTP Server ErrorThis error occurs when you are trying to log on to a Usenet newsgroup. An NNTP server is part of your Internet service provider's software, so if this error occurs the software may be malfunctioning or the newsgroup does not exist.
 Permission DeniedWhen connecting to an FTP site, can signify that you cannot upload to the site, download a certain file, or access a certain directory.
 Too Many Connections - Try Again LaterThe limit to the number of people who can use the site at one time has been exceeded.
 Too Many UsersTo avoid slow uploading and downloading rates, site administrators set a maximum number of users that can access the site at one time. Your request is one too many.
 Unable to Locate HostThe server is either down for maintenance or you may have lost your connection.
 Unable to Locate the ServerThe server indicated in the URL you typed or clicked from either no longer exists or was entered incorrectly.
 Viewer not FoundYour browser doesn't recognise files of this type.
 You Can't Log on as an Anonymous UserYou must have a valid username and password to log onto this FTP site.