This kind of error will usually produce a 404 file not found error message in the browser.

First try going to a common site that is online and available most of the time. You could try http://www.google.com or http://www.yahoo.com for example. If those sites work, then there is probably a problem with the particular site you are trying to reach.

If you cannot get to common sites, then there could be problems on the phone lines, with your dialup provider, or your dialup settings may be incorrect.

To solve this problem, call your dialup provider's support center, and have them walk you through the proper setup of the dialup connection.