This article was previously published under Q184344
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When you perform a reconcile to synchronize the database with the registry,after deleting the DHCP database, all reservations are put back into thedatabase but the media access control addresses are incorrect.
The DHCP server sends a NACK or does not respond to BOOTP requests from aclient as the request is based on the media access control address.
When the BOOTP request is processed by the DHCP server, the server matchesthe requested media access control address in the request to an IP addressand marks the reservation as in use. After performing a reconcile, themedia access control address is no longer correct in the DHCP database andthe client requests are either receive a NACK or the DHCP server does notrespond to the BOOTP request.
To resolve this problem, obtain the latest service pack for Windows NT 4.0 or Windows NT Server 4.0, Terminal Server Edition. For additional information, click the following article number to view the article in theMicrosoft Knowledge Base:
152734 How to Obtain the Latest Windows NT 4.0 Service Pack
Microsoft has confirmed that this is a problem in Windows NT 4.0 and Windows NT Server 4.0, Terminal Server Edition. This problem was first corrected in Windows NT 4.0 Service Pack 4.0 and Windows NT Server 4.0, Terminal Server Edition Service Pack 4.
Microsoft Windows NT Server 4.0, Terminal Server Edition, Microsoft Windows NT Server 4.0 Standard Edition, Microsoft Windows NT Server 4.0 Enterprise Edition, Microsoft BackOffice Small Business Server 4.0, Microsoft BackOffice Small Business Server 4.0a