The web server uses HTTP error messages to inform you when an error has occurred.

Here you will find explanations of the most common HTTP error messages.


  • 400 - Bad request: An incorrect syntax or an unknown character in the request causes the error message. We recommend that you check your Internet connection and update your browser if necessary.
  • 401 - Unauthorized: User authentication failed. This occurs in connection with password-protected directories. Please check the validity of your user data.
  • 403 - Forbidden: The request was not executed due to lack of client authorization. This can have several reasons:
    1. Check whether the called page has the necessary read rights (files: 644, directories: 755).
    2. The error may also mean that no start page could be found. In this case, make sure that the start page has a valid name and has been uploaded to the correct directory.
    3. Check if directory listing is enabled.
  • 404 - Not Found: The document was either removed, moved or renamed and therefore cannot be found. Check and correct the link specified in the document in the HTML/PHP text.
  • 410 - Gone: No website can be reached under the specified URL. Furthermore, no forwarding address is known.
  • 500 - Internal Server Error: You receive this message if the server could not execute an action (delivery of an HTML page, execution of a script) because it caused an internal error. Since this error message is very general, there can be many reasons: a faulty script, a software error on the web server or even reaching server limits (script runtime, memory usage, etc.).
  • 501 - Not Implemented: The required functionality or prerequisite for the server does not exist.
  • 502 - Bad Gateway: An invalid response from another server in gateway or proxy mode.
  • 503 - Service unavailable: The server is either overloaded, down or under maintenance.