NetDDE and RAS Connections

ID: q110315

The information in this article applies to:

Microsoft Windows NT operating system version 3.1
Microsoft Windows NT Advanced Server version 3.1

SUMMARY

When you attempt to use NetDDE over a Windows NT Remote Access Service (RAS) connection, the session can be started only by one of the systems. The system that can start the session is usually the one who dials into a RAS server. On the other system, a "Machine Name Not Found" error message appears.

MORE INFORMATION

NetDDE requires that a NCB.LISTEN be posted for the NetBIOS name of the clients. RAS for Windows NT defaults to not posting NCB.LISTEN for remote connections, but you can modify this in the registry. The registry entry is:

   HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\RemoteAccess
   \Parameters\NetbiosGateway\RemoteListen

The default value is 1 for enabling Messenger and Server services only. Change the value to 2 to include NCB.LISTEN for all remote client NetBIOS names.

Warning: Enabling NCB.LISTEN require the RAS server to post all NetBIOS names from remote connections to the network. With a 64-port RAS server and an average of 5 or 6 names per Windows NT client, this can mean at least 320 NetBIOS names. This can exceed the 254 NetBIOS name limit per protocol/NIC on Windows NT.

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Keywords          : kbnetwork
Version           : 3.1
Platform          : WINDOWS

Last Reviewed: August 17, 1998