Microsoft KB Archive/105999

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Article ID: 105999

Article Last Modified on 10/31/2006


  • Microsoft Windows NT Advanced Server 3.1
  • Microsoft Windows NT Workstation 3.1
  • Microsoft Windows NT Advanced Server 3.1
  • Microsoft Windows NT Workstation 3.51
  • Microsoft Windows NT Server 3.51

This article was previously published under Q105999


If an IBM Token Ring card is incorrectly configured for the data rate of the network (16 Mbps or 4 Mbps), the following error messages may appear when you view the System Log in Event Viewer

Nbf could not find adapter \Device\IbmTok0x

Nbf failed to bind to adapter \Device\IbmTok0x

where "x" is the adapter number of your card.

Also, checking under Control Panel, Network, and clicking the Bindings button will show that one or more protocols are not bound to the network adapter.


These messages do not reflect an error in Windows NT. The event log reports that it is unable to find the IBM Token Ring card. After the token ring adapter is initialized, it will attach to the ring. If the adapter is incorrectly configured, the attach will fail and the token ring driver device object "\deviceIbmTokOx" is not created. Thus any transports bound to this token ring adapter will also fail to start.


Correctly set the jumpers on the card for the data rate of the ring. Switch 12 of the switch block on the IBM Token Ring card sets the rate. For a Data Rate of 16 Mbps, set switch 12 to OFF. For a Data Rate of 4 Mbps, set switch 12 to ON.

For additional information on configuring the IBM Token Ring network adapter, call IBM technical support at (800) IBM-9397.


The NBF transport protocol is defined as NetBEUI Frame protocol, a descendent of the NetBEUI protocol. For additional information, please see the following article in the Microsoft Knowledge Base:

ARTICLE-ID: 128233
TITLE : Comparison of Windows NT Network Protocols

Additional query words: prodnt token-ring IBM NBF

Keywords: kbnetwork KB105999