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Windows 98 > Troubleshooting Windows 98


Dial-Up Networking Errors

By: Arie Slob

Here are some of the more common Dial-Up Networking Errors:

Error 629

After you install Windows 98 Second Edition, the 128-bit data encryption won't work, and you will get this error message when you attempt to create a Dial-Up Networking (DUN) connection that uses 128-bit data encryption:

Error 629: You have been disconnected from the computer you dialed.
Double-click the connection to try again.

If you try to (re)install the 128-bit version of the Windows 98 Dial-Up Networking Security Upgrade (Msnt128.exe) file, you are unable to do so. When you double-click the Msnt128.exe file, you receive the 128 bit encryption for Dial-Up Networking (Not for Export) dialog box. When you click OK, you quit the Msnt128.exe program.

This is caused because Windows 98 Second Edition includes a newer version of the 40-bit DUN files that replace the 128-bit DUN files.


Error 630

When you try to start Dial-Up Networking, you receive the following error message:

  • Error 630: The computer is not receiving a response
    from the modem. Check that the modem is plugged in,
    and if necessary, turn the modem off,
    and then turn it back on.

  • Communication port is invalid or busy.

This error message can occur if the modem is using a newly detected serial port installed by Windows 98 hardware detection. If this is the case, change the properties of the Dial-Up Networking connection to use the new modem settings.

Programs run at StartUp from the StartUp folder can also cause this error message.

To temporarily disable programs in the StartUp folder, follow these steps:

  1. Click Start > Run and in the Open: box, type msconfig, then press OK
  2. In Msconfig click the Startup tab. For programs that may control your modem, click the program's check box to clear it. If you are not sure whether or not a specific program should be disabled, click to clear all of the check boxes except for the following check boxes:

    • ScanRegistry
    • TaskMonitor
    • SystemTray
    • LoadPowerProfile (is loaded twice normally)

This behavior can also occur if you have the Support SerialKey devices Accessibility option configured to use the COM port to which your modem is connected. To resolve this:

  1. Click Start > Settings > Control Panel, and then double-click Accessibility Options
  2. On the General tab, either:

    • Click to clear the Support SerialKey devices check box

    or

    • Click Settings, click a different COM port in the Serial port box, and then click OK

  3. Click OK

When you try to use a 3Com (3C562) EtherLink III LAN + 33.6 Modem PC Card, you may receive the following error message:

  • Error 630 modem not responding

This behavior can occur if the registry entry for the PC Card device is incorrect or damaged. To resolve this issue, follow these steps:

  1. Remove the PC Card from the computer
  2. Use Registry Editor to export the following registry key:

      HKEY_Local_Machine \ Enum \ PCMCIA

  3. Delete the following registry key:

      HKEY_Local_Machine \ Enum \ PCMCIA \ LAN \ Modem

      If there is no LAN \ Modem key, delete the PCMCIA key

  4. Shut down Windows 98, and then turn off the computer
  5. Restart the computer
  6. After Windows 98 starts, insert the PC Card and allow Windows 98 to detect the card


If you receive this error on Windows 98 Second Edition, and you have an 3Com (USR) USB modem, you have 2 options and 1 workaround, until 3Com releases new drivers:

  • Option 1: Revert back to Windows 98 (Gold) (uninstall Windows 98 Second Edition)
  • Option 2: Install the modem as a serial device
  • Work-around:

    1. Select Start > Settings > Control Panel
    2. Double-click Modems, and then verify that your modem is listed on the General tab
    3. Click Diagnostics, select the COM port to which your modem is attached, and then click More Info

    Your modem should now be accessible to other Windows applications for the remainder of your Windows session.

    Note: This will need to be done each time windows has been restarted.


Error 633

When you try to start Dial-Up Networking, you receive the following error message:

Error 633: The modem is not installed
or configured for Dial-Up Networking.
To check your modem configuration, double click the Modems
icon in Control Panel.

This error message can occur if the Telephon.ini file is missing or damaged. To resolve this issue, please see the following Microsoft Knowledge Base Articles:

  • 191444 (Error Message: The Modem Is Not Installed or Configured for...)
  • 120221 (How to Rebuild the TELEPHON.INI File)


Error 645

When you try to connect with Dial-Up Networking (DUN), you may receive the following error message:

Error 645 - Dial-Up Networking could not complete the connection to the server.

This is usually caused if the Require encrypted password option is enabled on the Server Types tab in the connection's properties. Here's how to fix this:

  1. Select Start > Programs > Accessories > Communications > Dial-Up Networking
  2. Right-click your connection, and choose Properties
  3. Select the Server Types tab, click to clear the Require encrypted password check box
  4. Click OK


Error 650

When you try to connect, you receive the following error message:

Modem not responding (Error 650). For troubleshooting information,
click Help.

One workaround suggests enabling a post terminal window. Here's how:

  1. Select Start > Programs > Accessories > Communications > Dial-Up Networking
  2. Right-click your connection, and choose Properties
  3. On the General tab, click the Configure button
  4. Select the Options tab
  5. Place a check-mark in bring up terminal window after dialing

Just press continue when the post terminal window pops up after you connect.

Another 650 error:

(650) The computer you have dialed does not respond to a network request

You can get this occasionally when your ISP is busy, and they don't have a free I.P. address to assign to you.


Error 691

When you dial your Internet Service Provider (ISP), you may connnect successfully, but you receive the following error message:

Error 691: The computer you are dialing in to cannot establish a Dial-Up
Networking connection. Check your password, and then try again.

This error can occur for any of the following reasons:

  • You have set up the CompuServe service from the Online Services folder on the Start menu and you have not connected to CompuServe by using the CompuServe software included in Windows 98
  • The Telephon.ini file is missing or damaged
  • Your ISP uses a different file than the Rasapi32.dll file to verify the connection
  • The Rasapi32.dll file is a different version than the Rasapi32.dll file that is included with Windows 98
  • The Setupx.dll file is missing or damaged

For workarounds & solutions, see Microsoft Knowledge Base Article 188120 or 293298.


Error 745

When you try to start Dial-Up Networking, you receive the following error message:

Error 745: An essential file is missing.
Re-install Dial-Up Networking.

This error message can occur when a Dial-Up Networking dynamic-link library (DLL) file is missing or damaged. To resolve this issue, please see Microsoft Knowledge Base Article 174579.


More information on troubleshooting modem problems in Windows 98 can be found in Microsoft Knowledge Base Article 190554.

If you have trouble with you WinModem see Winmodem Problems on this Web site.