So you have seen the error 404, Page not found or website not found… what causes this? Well the most common cause of this simply is that the page that you were looking for is literally not in existence any more.
Other reasons you might get this error is simple things like typing the wrong address, the wrong URL or domain name. Often when you use a search engine the results that you get might link to a page that has been deleted since it was scanned by the search engine spider.
Sometime you might also get this error when your Internet connection has dropped out and needs to be reconnected either through the WiFi or plug the Ethernet cable back in.
It is true to say also in so cases that a virus might have messed up the hosts file on your computer redirecting the web browser permanently to another address, one that might have been taken down.
If your computer suddenly starts displaying 404 not found the entire time you go to use your web browser try restating your computer or tablet and see if that fixes that problem.
Try re-establishing the connection to the Internet from scratch, especially if you are using an access point.
In windows, you can always use system restore, to take your computer back to an earlier time to see if that fixes any issues that might have come from a change in configuration.
Check that your firewall isn’t blocking the site that you are going to, and always keep you anti-virus software up-to-date.
More examples of the 404 error from websites that have had pages taken down:
That web page doesn't exist.
404. That’s an error.
The requested URL /safsd was not found on this server. That’s all we know. - Google
We are sorry, the page you requested cannot be found.
The URL may be misspelled or the page you're looking for is no longer available. - Microsoft.com
The requested URL /idsadsa was not found on this server.
Apache/2.2.14 (Ubuntu) Server at server.net Port 80 -Ubuntu Server default error 404
Sorry, that page doesn’t exist!
Thanks for noticing—we're going to fix it up and have things back to normal soon. - Twitter
404 Page Not Found
The page you're looking for has either moved or is no longer on this website. Make sure to delete your old 'bookmark' or 'favorite' for that page and create a new one.
404 - File or directory not found.
The resource you are looking for might have been removed, had its name changed, or is temporarily unavailable.
Sorry, this page isn't available
The link you followed may be broken, or the page may have been removed. - Facebook
Server Not Found Error returned from Firefox:
Server not found
Firefox can't find the server at www.server.net.
Check the address for typing errors such as ww.example.com instead of www.example.com
If you are unable to load any pages, check your computer's network connection.
If your computer or network is protected by a firewall or proxy, make sure that Firefox is permitted to access the Web.
Server Not Found Error returned from Internet Explorer
Internet Explorer cannot display the webpage
What you can try:
Diagnose Connection Problems
This problem can be caused by a variety of issues, including:
•Internet connectivity has been lost.
•The website is temporarily unavailable.
•The Domain Name Server (DNS) is not reachable.
•The Domain Name Server (DNS) does not have a listing for the website's domain.
•There might be a typing error in the address.
•If this is an HTTPS (secure) address, click Tools, click Internet Options, click Advanced, and check to be sure the SSL and TLS protocols are enabled under the security section.
For offline users
You can still view subscribed feeds and some recently viewed webpages.
To view subscribed feeds
1.Click the Favorites Center button , click Feeds, and then click the feed you want to view.
To view recently visited webpages (might not work on all pages)
1.Click Tools , and then click Work Offline.
2.Click the Favorites Center button , click History, and then click the page you want to view.
Server Not Found Error returned from Chrome
Oops! Google Chrome could not find www.server.net