Windows NT 4 VPN Configuration

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NOTE: The following instructions are for connecting to a Real Time Linux Firewall with VPN services only, if you are trying to connect to any other server, these instructions will not help you.

Take a look at Real Time's Firewall and VPN information to learn more about our Linux Solutions.



Windows NT 4 Service Pack 6a (High Encryption). Note that you must apply the Service Pack after installing the PPTP packages.

  1. First, go to your Control Panel by clicking on the Start button, then Settings, then Control Panel. Double-click the Network icon, shown below.

    Control panel

  2. After clicking on the 'Protocols' tab, a window like the one pictured should appear. Click on the 'Add' button.

    Network protocols

  3. Find the entry for 'Point To Point Tunneling Protocol', then double-click to select it.

    Select Network Protocol

  4. Windows will then want to install some files. You will need a Windows NT install CD at this point. Put the CD in the CD-ROM drive, and click 'continue', to have Windows install the software.

    Windows NT setup - copy files

  5. After the software is installed, Windows will prompt you for the number of VPNs you wish to set up. Since you only need one, choose the default '1'.

    Number of VPN's

  6. You will now need to configure Remote Access Services, so you can use them over PPTP. Click 'OK' on the dialog box pictured here.

    RAS setup

  7. Choose the VPN1 device from the drop-down list, and click 'OK'.

    Add RAS

  8. You will then see a dialog box listing all your VPN devices. Just click 'Continue' here.

    RAS device list

  9. This will take you back to the Network Protocols window. There should now be an entry for 'Point To Point Tunneling Protocol' there. Click 'OK'.

    Network Protocol Window

  10. Windows will now want to reboot. Click 'Yes'.

    Reboot prompt

  11. At this point, install Windows NT 4 Service Pack 6a (High Encryption). Simply download the file to your C:\temp directory, browse to it with Windows Explorer, then double-click on it to install the Service Pack. This Pack is needed for PPTP to work properly.

Installing Windows NT Service Pack 6a

First, download the Service Pack to the c:\temp directory on your computer.

    Locate ServicePack

  1. Double-clicking the file you just downloaded will cause it to extract its files, and launch the update program.

    Installing Service Pack

  2. When it asks for you to accept the License Agreement, check 'Accept the License Agreement', and click 'Install'.

    End User License Agreement

  3. The Service Pack should then copy all the update files you need. In addition to updating the files needed for PPTP to work properly, this will also update the rest of the files on your system to the latest secure version.

    Service Pack installation

  4. Once the update is finished, Windows will ask you to reboot again.

    Service Pack setup

  5. After installing the latest Service Pack and rebooting, double-click on the 'My Computer' icon on your desktop. This should open up a window like the one shown. Double click on the 'Dial-Up Networking' icon, highlighted in the picture.

    My computer - dial-up networking

  6. If you have never set up a Dial-Up Networking connection before, it will present you with this screen, asking for your area code. Put in your area code and click 'Close'.

    Dial-Up networking setup

  7. At this point, it may complain that 'The phonebook is empty'. This simply means you haven't added any entries yet. Click 'OK'.

    New phonebook entry

  8. Next, it will ask you for a name for the new connection you are making. This is the name that will appear by the icon once you have created the connection; but has no other significance. Click 'Next'.

    Dial-Up Networking Wizard

  9. Make sure that only the 'I am calling the Internet' box is checked. Click 'Next'.

    Dial-Up Networking Server Options

  10. At the next dialog box, put in the address of the PPTP server. This information should have been given to you at some point. Click 'Next'.

    VPN Server Address

  11. Click 'Finish' to finish setting up the connection profile. If you wish to have an icon for Dial-Up Networking on your desktop, simply right click on the 'Dial-Up Networking' icon, choose 'Create Shortcut' from the menu that appears, and answer 'yes' when it asks you if you'd like to put the icon on the desktop.

  12. Finish

  13. Now, double-click on your Dial-Up Networking icon, to get to the screen displayed here. Next, click on the button titled 'More', and choose 'edit entry and modem properties' from the drop-down list that appears.

    Edit VPN Connection Properties

  14. Click on the 'Server' tab' to get the screen shown. Then, click on the 'TCP/IP Settings' button.

    Server Settings

  15. In 'PPP TCP/IP Settings' window, place a check in the following: Server assigned IP address, Server assigned name server addresses and Use IP header compression. Afterwards, click 'OK' to accept the changes; and then 'OK' and 'Close', to close the underlying windows.

    TCP/IP Settings

  16. You will then need to change your computer's workgroup to that of the remote network, so that you may successfully join the remote network's workgroup. Go to the Network icon on your Control Panel again (via Start -> Settings -> Control Panel -> Network); then click on the 'Change' button, and change the Workgroup entry, to that of the remote network's workgroup (that workgroup name should be given to you, among your other VPN information). You can then close the 'Network' dialog box. Windows may ask to be rebooted at this point.

    Reset Workgroup

  17. Congratulations! You should be done at this point.

  18. When you wish to connect to your PPTP server, double-click on the icon for Dial-Up Networking; choose the connection you wish to dial; then click 'Dial'.

    Edit Properties

  19. Now enter the password you were given along with your other VPN information, make sure your Domain is set to the proper value (given in your information), and click 'OK' . This should launch your PPTP connection, setting up a VPN between your computer, and the remote network you wish to connect to, such that it appears you are on the remote network.

    Connection window

The instructions and screen shots contained within this website are specific to services offered by Real Time Enterprises only.

If you have any problems connecting to Real Time after carefully following these directions, please call (952) 943-8700 and we will be happy to help you.


Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.1 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts and no Back-Cover Texts. A copy of the license is included in the section entitled "GNU Free Documentation License".

Real Time Enterprises, Inc.

Real Time Enterprises, Inc.
10181 Crosstown Circle
Eden Prairie, MN 55344

Phone: (952) 943-8700
Fax: (952) 943-8500

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