404: Not Found

Another common browser message, a Not Found indicates that a website you’re trying to view may not exist anymore. Alternatively, the page could have been moved to a different server or renamed to something else.
Once again, you want to check the spelling of your URL and ensure that you’ve spelled it correctly. If it’s still not working, you may want to try changing the URL until you’re able to locate the main site.
For example, if you’re searching for yourwebsite.com/mainpage/fun, try searching instead for yourwebsite.com/mainpage. Keep doing that until you end up at www.yourwebsite.com, the main part of the site. If the URL works, you can try to manually navigate to the intended destination.
Some webmasters design custom error pages for links on their website that no longer work or are outdated.
While some of these error messages may be humorous or interesting, they all mean the same thing every other messages means — but they are customized so the viewer can actually understand what’s going on.
Generally, these custom error messages are used in place of your standard 404: Not Found browser error, but they can be used for other errors as well.
Now that you know what all of these browser messages are REALLY saying, you can surf the web without worrying too much about these bad boys popping up.