The 9 Most Common Browser Error Messages

Browser error messages appear in all browsers, like Internet Explorer, FireFox, etc. Browser error messages are actually called HTTP status codes and appear when there is some kind of error loading the web page.

The most common browser error messages are listed below with helpful tips to help you get past them and on to the web page you were looking for.

400: Bad Request

The 400 Bad Request browser error means that the request you sent to the website server (i.e. a request to load a web page) was somehow malformed therefore the server was unable to understand or process the request.

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401: Unauthorized

The 401 Unauthorized browser error means the page you were trying to access can not be loaded until you first log on with a valid user ID and password. If you have just logged on and received the 401 Unauthorized error, it means that the credentials you entered were invalid.

Invalid credentials could mean that you don’t have an account with the web site, your user ID was entered incorrectly, or you password was incorrect.

403: Forbidden

The 403 Forbidden browser error means that accessing the page or resource you were trying to reach is absolutely forbidden.

404: Not Found

The 404 Not Found browser error means that the page you were trying to reach could not be found on the web site’s server. This is the most popular browser error message that you will probably see. This browser error message also often appears as The page cannot be found.

408: Request Timeout

The 408 Request Timeout browser error means the request you sent to the website server (i.e. a request to load a web page) took longer than the website’s server was prepared to wait. In other words, your connection with the web site “timed out”.

500: Internal Server Error

The 500 Internal Server Error is a very general browser error meaning something has gone wrong on the web site’s server but the server could not be more specific on what the exact problem is.

502: Bad Gateway

The 502 Bad Gateway browser error means that one server received an invalid response from another server that it was accessing while attempting to load the web page or fill another request by the browser.

503: Service Unavailable

The 503 Service Unavailable browser error means the web site’s server is simply not available at the moment. This is usually due to a temporary overloading or maintenance of the server.

504: Gateway Timeout

The 504 Gateway Timeout browser error means that one server did not receive a timely response from another server that it was accessing while attempting to load the web page or fill another request by the browser. This usually means that the other server is down or not working properly.

Copied from about.com

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