RAS konfigurasjon 2   











Configuring Remote Access Service (RAS) for Windows NT

This article describes how to configure RAS for the Windows NT 3.5 and 4.0 operating systems.


A RAS connection allows you to access a network over a telephone line by connecting to a RAS server computer that is part of a Windows NT network. Once you connect to the network, RAS essentially makes the telephone line transparent in which you can access the network resources as if you were at a local computer in your office. You can almost think of RAS as something that turns a dialup modem into an ordinary network card. That is, the RAS Server acts as a gateway between a remote client (that is, your computer) and the network.

Any network application that uses one of the network interfaces below will be able to work over RAS:

  • NetBIOS
  • IPC
  • Mailslots
  • Named Pipes
  • RPC
  • LAN Manager APIs

On Windows 3.x and Windows 95, Wonderware® NetDDE can be configured for the serial interface and perform a NetDDE connection itself. Since Microsoft included its own version of NetDDE with the Windows NT operating system (called Network DDE), there is no serial interface configuration option. Therefore, RAS can be used to perform NetDDE over a serial connection in Windows NT.

RAS Installation Procedure

Follow these steps to install and configure a RAS connection over a telephone line using a dialup modem.

Note The illustrations for this procedure are based on Windows NT 4.0. If you are running Windows NT 3.51, the procedure is essentially the same, but some of the dialog boxes will look different.

  1. Make sure that the Network DDE service is up and running on all computers that will be performing NetDDE transactions. You can check this by double-clicking the Services program icon under the Control Panel window.

Also, make sure that you create and trust the DDE Shares on the server computer, as if they were configured for a LAN (Local Area Network).

  1. Insert the Windows NT CD-ROM into your CD-ROM drive. Open the Control Panel window and double-click the Network program icon. The Network Services dialog box should appear. Select the Services tab. Click the Add button on the Network dialog box. The Select Network Service dialog box should appear:


Scroll down the Network Service listbox and highlight Remote Access Service. Click the OK button.

The Remote Access Service will now be installed on your computer. You will be prompted for various configuration choices (example, modem settings). Once RAS is installed, you should see Remote Access Service listed as one of the Network Settings in the Network Services dialog box. You will be prompted to reboot your system after the installation completes.

  1. Start up the Windows NT User Manager program found under the Administrative Tools program group. The User Manager window should appear, as shown on the next page:


Add the usernames that will need to dial in using RAS. Apply the default user permissions.

  1. Start up the RAS Administration utility from the Administrative Tools program group. The Remote Access Admin window should appear:


The RAS Administration utility allows you to monitor RAS client applications on a domain as well as the RAS ports on a specific server computer. Using this utility, you can disconnect or send messages to specific RAS clients, start and stop and pause and continue the Remote Access Service on a RAS server, and grant or terminate RAS permissions, including setting pre-set call back phone numbers on specific RAS servers.

Select Permissions from the Users menu to define the RAS permissions for your users. The Remote Access Permissions dialog box should appear:


Highlight the users in the Users listbox that were added in step 3 and select the Grant dialin permission to user checkbox.

Troubleshooting Your RAS Connection

If you are using one of the modems named in the Hardware Compatibility List that was displayed during the RAS installation, and you still cannot connect to the network, then follow the appropriate steps below.

  1. Check for any loose cables and make sure the cabling is correct.
  2. Make sure that the modem has been installed correctly by referencing the modem’s user documentation.
  3. Use a terminal emulator program such as Windows NT HyperTerminal and try to issue commands to the modem. Example, type ATDT.
  4. Turn on Device Logging in the Windows NT Registry by changing the following key:


Using RAS for a Direct Serial Connection

Note If, for some reason, you do not have a modem (or you do not want to use a modem), you can connect two computers that do not have a network adapter card by using RAS over a direct serial connection. However, Wonderware Technical Support does not recommend this method because it is a slower network connection and password verification will still be needed. Note that this method works best if the two computers are physically near each other.

You can connect two computers together through RAS by selecting a null modem from the list of modems when you configure the COM ports for a serial connection. A null modem must be configured on both the client node and the server node.

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Copyright © 2002 Øyvind Haugland
Sist endret:  13 januar 2019

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