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Microsoft KB Archive/172956

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Knowledge Base

RAS Clients Fail to Connect with IP Assigned via DHCP

Article ID: 172956

Article Last Modified on 10/31/2006


  • Microsoft Windows NT Server 4.0 Standard Edition
  • Microsoft Routing and Remote Access Service Update for Windows NT Server 4.0

This article was previously published under Q172956


Your Remote Access Service (RAS) clients may experience problems attempting to connect to your computer running Windows NT Server and running either RAS or Routing and Remote Access Service (RRAS). The RAS clients may receive one or more of the following error messages when they fail to connect:

Dial-Up Networking could not negotiate a compatible set of network protocols you specified in the Server Type settings. Check your network configuration in the Control Panel then try the connection again.


TCP/IP CP reported error 733: the PPP control protocol for this network protocol is not available on the server.

NOTE: This issue has only been reported with RAS or RRAS servers that are configured to assign IP addresses through Dynamic Host Configuration Protocol (DHCP).


This issue may be caused by the RAS or RRAS server failing to successfully obtain a complete set of IP address leases from the DHCP server.


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.

To resolve this issue, use one of the following methods:

  • Change the configuration of the RAS or RRAS Server to use a static pool of IP addresses for its dial-up clients, using the following steps:

    1. Click Start, point to Settings, click Control Panel, and then double-click the Network icon.
    2. Click the Services tab, click Remote Access Service, and then click Properties.

      NOTE: For an RRAS server, click Routing and Remote Access Service instead of Remote Access Service.
    3. Click Network in the Remote Access Setup dialog box and click Configure for the TCP/IP Protocol in the Server Settings section in the Network Configuration dialog box.
    4. Click the Use Static Address Pool radio button and type a beginning and ending range of IP addresses to use for your RAS clients.
    5. Click OK twice, click Continue, click Close, and then restart your computer when prompted.


  • Obtain a new set of IP Addresses for your RAS pool by performing the following steps:

    1. Delete all active leases in DHCP manager for the RAS or RRAS Service by performing the following steps:
      1. Click Start, point to Programs, point to Administrative Tools, and then click DHCP Manager.
      2. Double-click the DHCP Scope.
      3. Select the active leases and click Delete.
    2. Delete the DHCPAddresses key from the registry by performing the following steps:
      1. Click Start, click Run, type regedt32.exe, and then click OK.
      2. Go to the following subkey:

      3. Click Delete on the Edit menu and click Yes in the Warning dialog box.
      4. Close Registry Editor and restart your computer.


  • Verify that your DHCP Server is operating correctly by trying to Renew the address of one of your Local Area Network (LAN) clients.


Microsoft has confirmed this to be a problem in Windows NT version 4.0. We are researching this problem and will post new information here in the Microsoft Knowledge Base as it becomes available.

Keywords: kbbug kberrmsg kbnetwork KB172956