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404 Not Found - The browser could not find the specific document that you requested on the host computer. To resolve this error, check the Uniform Resource Locator (URL) syntax (some URLs are case sensitive). In addition, the page may have been removed, had its name changed, or have been moved to a new location.
403 Forbidden/Access Denied - The Web site you requested requires special access permission (for example a password).
503 Service Unavailable - The host computer is too busy. Try viewing the page again after about 30 seconds.
Connection Refused by Host - This is a version of the 403 error. The Web site you requested requires special access permission.
Not Found - The link no longer exists.
Site Unavailable - Too many users are trying to access the site, the site is down for maintenance, there is noise on the line, or the site no longer exists. This can also be caused by a user URL syntax error.
Too Many Users - The site is busy. You may want to try again after about 30 seconds.
Unable to Locate Host - The URL did not return anything, the site is unavailable, or the Internet connection was dropped. Check the hardware connections and URL syntax. | 
