Common Internet Connection Error Codes and What They Mean

400 Bad File Request
A 400 Bad File Request error is something that most Web searchers will eventually see online. Learn what a 400 Bad File Request error is at the About.com glossary of Web search terms.

403 Forbidden Error
A 403 Forbidden Error is a common Web phenomenon that most Web searchers will eventually come across. Learn what a 403 Forbidden Error means and what you can do about it at the About.com glossary of Web search terms.

404 File Not Found Error
Have you hit the dreaded 404 File Not Found error in your Web searches? Learn what the 404 file not found error means along with other Web search issues at the About.com glossary of Web search terms.

Network Connection Refused
You're trying to visit a Web site, but instead, you get the "network connection refused" error. Find out what this message means at the About.com glossary of Web search terms.

Unable to Locate Host
Ever tried to get to a Web site and get the "unable to locate host" error message? Find out what the "unable to locate host" error means and what you can do about it at the About.com glossary of Web search terms.

Host Unavailable
Your favorite site gives you the message "host unavailable". What does this mean? Find out what "host unavailable" and other Web server errors mean at the About.com glossary of Web search terms.

503 Service Unavailable
Did you get a "503 Service Unavailable" error when you tried to visit your favorite Web site? Learn what a 503 Service Unavailable error means at the About.com glossary of Web search terms.