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Apache Server Error Codes

See my page on How to Build a Custom Error Page

Informational Return Codes
100 Continue  
101 Switching Protocols  
Successful Client Requests
200 OK  
201 Created  
202 Accepted  
203 Non-Authoritative Information  
204 No Content  
205 Reset Content  
206 Partial Content  
Client Request Redirected
300 Multiple Choices  
301 Moved Permanently  
302 Moved Temporarily  
303 See Other  
304 Not Modified  
305 Use Proxy  
307 Temporary Redirect  
Client Request Errors
400 Bad Request  
401 Authorization Required Microsoft IIS 4.0+ defines these sub-errors
  • 401.1 - Logon failed
  • 401.2 - Logon failed due to server configuration
  • 401.3 - Unauthorized due to ACL on resource
  • 401.4 - Authorization failed by filter
  • 401.5 - Authorization failed by ISAPI/CGI application
402 Payment Required  
403 Forbidden Microsoft IIS 4.0+ defines these sub-errors
  • 403.1 - Execute access forbidden
  • 403.2 - Read access forbidden
  • 403.3 - Write access forbidden
  • 403.4 - SSL required
  • 403.5 - SSL128 required
  • 403.6 - IP address rejected
  • 403.7 - Client certificate required
  • 403.8 - Site access denied
  • 403.9 - Too many users
  • 403.10 - Invalid configuration
  • 403.11 - Password Change
  • 403.12 - Mapper Denied Access
  • 403.13 - Client certificate revoked.
  • 403.14 - Directory listing denied.
  • 403.15 - Client Access Licenses exceeded.
  • 403.16 - Client certificate is untrusted or invalid.
  • 403.17 - Client certificate has expired or is not yet valid.
  • 403.18 - Cannot execute requested URL in the current application pool. This error code is specific to IIS 6.0.
  • 403.19 - Cannot execute CGIs for the client in this application pool. This error code is specific to IIS 6.0.
  • 403.20 - Passport logon failed. This error code is specific to IIS 6.0.
404 Not Found Microsoft IIS 4.0+ defines these sub-errors
  • 404.0 - (None) File or directory not found.
  • 404.1 Web site not accessible on the requested port.
  • 404.2 Web service extension lockdown policy prevents this request.
  • 404.3 MIME map policy prevents this request.
405 Method Not Allowed  
406 Not Acceptable (encoding)  
407 Proxy Authentication Required
408 Request Timed Out  
409 Conflicting Request  
410 Gone  
411 Content Length Required  
412 Precondition Failed  
413 Request Entity Too Long  
414 Request URI Too Long  
415 Unsupported Media Type  
416 Requested range not satisfiable  
417 Execution failed  
423 Locked error NOTE: Microsoft IIS 4.0+ error code
Server Errors
500 Internal Server Error Microsoft IIS 4.0+ defines these sub-errors
  • 500.12 - Application is busy restarting on the Web server.
  • 500.13 - Web server is too busy.
  • 500.15 - Direct requests for Global.asa are not allowed.
  • 500.16 - UNC authorization credentials incorrect. This error code is specific to IIS 6.0.
  • 500.18 - URL authorization store cannot be opened. This error code is specific to IIS 6.0.
  • 500.100 - Internal ASP error.
501 Not Implemented Header values specify a configuration that is not implemented.
502 Bad Gateway Microsoft IIS 4.0+ defines these sub-errors
  • 502.1 - CGI application timeout.
  • 502.2 - Error in CGI application.
503 Service Unavailable
504 Gateway Timeout
505 HTTP Version Not Supported