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Common Dial up Networking Error Codes PDF Print E-mail
Errors 600 through 649
Almost all of these are "hardware" related issues. This means that the modem is not responding properly to Windows. The only thing you can really do here is "reset" your modem and the best way to do that is to turn it off for a few minutes. Also shut down the computer for a few minutes, and then try again. If the problem continues, the modem may be faulty.

Errors 650 through 699

Error 650 - A sign that Dial-Up Networking in Windows is NOT working properly. To repair this error a Re-installation of Dial-Up Networking in Windows is required. Dial-Up Networking is a bunch of applications and detail files that Windows use to make the connection with the modem, and then the connection with Internet.

Error 676/678 - Generally means that the computer is not communicating with the modem. These are often bad and tend to indicate a modem driver issue, although often, the modem maybe faulty. If a modem fails, this error will come up.

Error 680 - The modem may not be installed correctly (especially if it is a PCI or soft-modem) or the cable from the modem to the phone-line jack may be bad or installed in the wrong connector on the modem - try another line cord, and make sure you are plugged into the LINE - not phone jack on the modem.

Error 691 - Authentication issue. There’s no problem with the connection, but you can not get logged in. This is 9 out of 10 times a Username / Password issue. The last one of these could deal with your account and its status. Clear out the username and password fields (hit backspace & delete a couple times to make sure there are no hidden spaces which count as characters) then retype your username and password.

Errors 700 and above
This series of errors started in the early Windows NT days, and the one thing about them is that they were more definitive than before. This helped identify the issues faster. But since not many of us have NT, these are rare. But when they show up, they are specific.

Error 709 - A sign that the settings are not quite right, and should be completely redone.

Error 718 – This is a timeout error which is not good, but since the modem is waiting for information, generally this could be a phone line issue. A really bad phone line will cause this error.

Errors 720/731 - This is a configuration error. Usually re-doing your settings solves the issue.

Error 745 - An essential File is missing. There are few ways through which a file can be missing. Windows, on loading, has a complete list of files loaded and if one fails it will tell you right away. So, for this error to arrive later is suspicious. One example of this is when a Virus program has quarantined a file like "winsock.dll", which is an essential file for Windows 95/98, in the early days, but not so today, but if this happens, it will make things really tough. And this should be rare, since the Virus programs should know that this file is needed and can not be locked up.

The Wordy Errors

These are often an extension of the other errors above. The likes of "the computer is not receiving a response from the (other) modem"; "The computer you're dialing into is not responding" (Notice similarity to previous one); "You have been disconnected from the computer you dialed"; and so on. These are not incorrect messages by any stretch of the imagination, as they DO reflect the conditions fairly well. However they do not provide more detail that would be more indicative of the issues. For example, both of the first ones could be a phone line issue, just as easily as it could be a modem driver issue ... in other words, how can the other computer respond, if it is not getting enough data to respond to through the phone line?

These are probably the most common errors that are related to modems in a Windows environment. In all cases, "resetting" the modem is a good thing, and may bring things back up to normal, however, if they continuously appear, then you know that something needs to be done about it. And the good thing is that for the most part this all can be done easily enough.

 
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