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An "Error 611" or "Error 720" error message occurs when you try to dial out from a Windows NT Remote Access Service (RAS) client and an event log error occurs when the Remote Access Service (RAS) server service fails to start

This article was previously published under Q123298
This article applies to Windows 2000. Support for Windows 2000 ends on July 13, 2010. The Windows 2000 End-of-Support Solution Center is a starting point for planning your migration strategy from Windows 2000. For more information see the Microsoft Support Lifecycle Policy.
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When you attempt to dial out from a Windows NT Remote Access Service (RAS) client using the Remote Access protocol Serial Line Internet Protocol (SLIP) or Point to Point Protocol (PPP) to a TCP/IP server, you receive one of the following error messages:

Using SLIP

Error 611: Route is not available

Using PPP

Error 720: No PPP control protocols configured.
Additionally, when you start the Windows NT-based computer, the Remote Access Service does not start. You may receive the following error in the event log:
   Event ID: 20055   Source: RemoteAccess   Description: The Remote Access Service server could not be started                because it has been configured to access the network and                there are no network adapters available.
This problem may have several different causes. Two known causes are the NetBIOS interface not being installed or removed and the NetBIOS binding being disabled. The NetBIOS interface is required for establishing logical names and sessions on the network for Windows NT.

Important This section, method, or task contains steps that tell you how to modify the registry. However, serious problems might occur if you modify the registry incorrectly. Therefore, make sure that you follow these steps carefully. For added protection, back up the registry before you modify it. Then, you can restore the registry if a problem occurs. For more information about how to back up and restore the registry, click the following article number to view the article in the Microsoft Knowledge Base:
322756 How to back up and restore the registry in Windows

To correct this problem, select the Network option from Control Panel and do the following:
  1. Verify that the NetBIOS interface is installed.

    If necessary, use the following steps to install the NetBIOS interface:
    1. Click Start, point to Settings, click Control Panel, and then double-click the Network icon.
    2. Click Add Software.
    3. Click NetBIOS Interface in the Network Software list, and then click Continue.
    4. Type the location of your Windows NT files, and then click Continue.
    5. Click Close, and then restart the computer when you are prompted.
  2. Verify that the bindings of the NetBIOS interface are enabled and properly established with the NDISWAN drivers. To do so:
    1. Start Registry Editor, and locate the following key:
      00xx is the subkey that is defined in "DriverDesc" as "WAN Miniport(IP)".
    2. Click the LinKage subkey.
    3. In the detail pane, you should have a "RootDevice" of "NdisWanIp". In addition, there will be an "UpperBind" key, which needs to have a value of Tcpip.
For more information about RAS Error 720, click the following article numbers to view the articles in the Microsoft Knowledge Base:
152605 RAS Error 720 when dialing out
122748 Err Msg: Error 720: No PPP control protocols configured
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Article ID: 123298 - Last Review: 12/04/2015 10:44:50 - Revision: 3.4

Microsoft Windows 2000 Server, Microsoft Windows 2000 Professional Edition, Microsoft Windows NT Workstation 3.5, Microsoft Windows NT Workstation 3.51, Microsoft Windows NT Workstation 4.0 Developer Edition, Microsoft Windows NT Server 3.5, Microsoft Windows NT Server 3.51, Microsoft Windows NT Server 4.0 Standard Edition

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