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Q162293: Troubleshooting RAS Client Issues in Windows NT 4.0

Article: Q162293
Product(s): Microsoft Windows NT
Version(s): 4.0
Operating System(s): 
Keyword(s): kbnetwork _IK12469kbfaq
Last Modified: 14-MAR-2002

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The information in this article applies to:

- Microsoft Windows NT Server version 4.0 
- Microsoft Windows NT Workstation version 4.0 
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SUMMARY
=======

This article contains steps to help you troubleshoot issues with the Remote
Access Service (RAS) in Windows NT 4.0. This article focuses on issues that can
occur when you use RAS to dial into another computer or an Internet service
provider (ISP).

The issues discussed in this article include:

- Cannot dial with RAS

- Cannot connect after dialing with RAS

MORE INFORMATION
================

Cannot Dial with RAS
--------------------

When you attempt to dial with Dial-Up Networking, the following error message may
appear:

  Error 692: Hardware failure in port or attached device.

If you receive this or another error message that indicates that the modem is not
working properly, refer to the following articles in the Microsoft Knowledge
Base:

  ARTICLE-ID: Q161516
  TITLE : Troubleshooting Modem Problems Under Windows NT 4.0

  ARTICLE-ID: Q122839
  TITLE : Err Msg: Error 692: Hardware Failure in Port or Attached...

If you have upgraded from Windows NT 3.51 and you are running a program that
monitors the phone line (for example, a fax program), you may receive an error
message that indicates the port is busy when you try to dial out with Dial-Up
Networking. For example:

  Error 633: The port is already in use or is not configured for Remote Access
  dial out.

If you installed RAS in Windows NT 3.51 before upgrading to Windows NT 4.0, the
kernel-mode telephony driver that is used in Windows NT 3.51 is retained and RAS
uses non-Unimodem drivers. If another program uses the Unimodem driver and is
set answer the line automatically, that program causes TAPI 2.0 to control the
communications port. When this occurs, the communications port is not available
to the non-Unimodem version of RAS.

To resolve this problem, remove the non-Unimodem driver and replace it with one
supplied with Windows NT 4.0. To do so, follow theses steps:

1. In Control Panel, double-click Network.

2. Click the Services tab.

3. Click Remote Access Service, and then click Properties.

4. If the type of modem listed indicates that the kernel-mode TAPI driver is
  still being used [that is, it lists the type as "Modem (modem.inf)"], click
  the port, and then click Remove.

5. Click Add to add the Unimodem driver (the driver supplied with Windows NT
  4.0) for this COM port.

6. Click Continue and restart your computer when prompted to do so.

Cannot Connect After Dialing with RAS
-------------------------------------

If the telephone line is unusually noisy, you may receive an error message such
as:

  Error 640: A Netbios error has occurred.

This message indicates that the modem may not be able to negotiate a connection
at a higher speed. Try setting the modem speed on the client computer down to a
lower speed such as 9600 bps. To do so, follow these steps:

1. In Dial-Up Networking, click the appropriate phone book entry.

2. Click More, and then click Edit Entry And Modem Properties.

3. Click the appropriate modem, and then click Configure.

4. In the Initial Speed box, click 9600, and then click the Enable Modem
  Compression check box to clear it.

5. Click OK.

6. Click the Server tab, click the Enable Software Compression check box to
  clear it, and then click OK.

If the RAS server does not answer or you cannot connect, test the connection from
another computer. If you cannot connect using another computer, there may be a
problem with the RAS server. Contact your network administrator for assistance.

If you can connect to the RAS server from another computer, there may be a
hardware compatibility problem with your modem. Check the Windows NT Hardware
Compatibility List (HCL) to see if your modem is listed. For information about
where to obtain the HCL, see the following article in the Microsoft Knowledge
Base:

  ARTICLE-ID: Q131303
  TITLE : Latest Windows 2000 and Windows NT Hardware Compatibility List (HCL)

If your modem is not listed, contact the modem's manufacturer or consider trying
a supported modem.

Additional query words:

======================================================================
Keywords          : kbnetwork _IK12469 kbfaq
Technology        : kbWinNTsearch kbWinNTWsearch kbWinNTW400 kbWinNTW400search kbWinNT400search kbWinNTSsearch kbWinNTS400search kbWinNTS400
Version           : :4.0

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