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:

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Using SLIP

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Using PPP

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.

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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.

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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:
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: a. Click Start, point to Settings, click Control Panel, and then double-click the Network icon. b. Click Add Software. c. Click NetBIOS Interface in the Network Software list, and then click Continue. d. Type the location of your Windows NT files, and then click Continue. e. 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: a. Start Registry Editor, and locate the following key: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class\{4D36E972-E325-11CE-BFC1-08002BE10318}\00xx 00xx is the subkey that is defined in "DriverDesc" as "WAN Miniport(IP)". b. Click the LinKage subkey. c. 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.

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For more information about RAS Error 720, click the following article numbers to view the articles in the Microsoft Knowledge Base:

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