Disabling Support for Unimodem Modems in Remote Access

• Microsoft Windows NT Workstation version 4.0
• Microsoft Windows NT Server version 4.0

SUMMARY

Windows NT 4.0 Remote Access Service (RAS) includes support for Unimodem modems. If you attempt to use a device with RAS that is not supported by Unimodem, you may need to configure RAS to use the Modem.inf file instead of using Unimodem.

MORE INFORMATION

To use the Modem.inf file instead of Unimodem in RAS, perform the following steps:

WARNING: Using Registry Editor incorrectly can cause serious, system-wide problems that may require you to reinstall Windows NT to correct them. Microsoft cannot guarantee that any problems resulting from the use of Registry Editor can be solved. Use this tool at your own risk.

1. Start Registry Editor (Regedt32.exe) and go to the following subkey:

         HKEY_LOCAL_MACHINE\Software\Microsoft\RAS\Protocols
   

2. On the Edit menu, click Add Value.

3. Type the following values:

         Value Name: EnableUnimodem
         Data Type: REG_DWORD
         Value: 0
   

4. Quit Registry Editor and restart Windows NT.

5. Run the Network applet in Control Panel and choose the Services tab.

6. Select Remote Access Service from the list of installed services and click the Properties button.

7. Remove any ports currently defined in the RAS Setup dialog box.

8. Click the Add button and re-add the ports. RAS will now use the Modem.inf file to retrieve initialization information for the devices you add.