Dialup Error Codes

Common Dial up Networking Error Codes

Errors 600 through 649
Almost all of these are "hardware" related. Meaning that the modem itself 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 about 3 minutes. It is often said that it takes 200 seconds for all the static electricity to dry up in the motherboard of the average computer. So the 3 minute rule applies here. Turn the machine off for 3 minutes, and then try again. If it continues happening, the modem may be in trouble.

Errors 650 through 699

  • Error 650 - Generally a sign that Dial-Up Networking (DuN for short) in Windows is NOT working right. The main fix here is a Re-installation of Dial-Up Networking in Windows. DuN is a bunch of applications and detail files that Windows uses to make the connection with the modem, and then the Internet.
  • Error 676/678 - Generally means that the computer is not talking to the modem. These are often bad and tend to indicate a modem driver issue, although often, the modem maybe done for. If a modem fails, this error will come up.
  • Error 680 - Your pet has been playing with that phone line! Yep! The "No Dial Tone" error could be that the phone cord to the modem is unplugged, or damaged. The other option is that the modem did not disconnect properly that last time you went online. Rebooting the computer will often solve the problem in that case.
  • Error 691 - Authentication issue. The connection is working, but you can not get logged in. This is a Username/Password issue 9 out of 10 times. The last one of these could deal with your account and its status. Clear out the username and password boxes completely (hit backspace & delete a couple times to make sure there are no hidden spaces which count as characters) and retype your username and password.

Errors 700 and up
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 nice and specific.

  • Error 709 - A sign that the settings are not quite right, and should be completely redone.
  • Error 718 - Timeout Error. Not good. But since the modem is waiting for information, generally this could be a phone line issue. A really bad phone line will causes this error.
  • Errors 720/731 - 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.

Article ID: 64

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