Article ID: 195932
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Your DHCP server has IP address reservations that are outside of your DHCP scope. After you apply Service Pack 4, clients that match these reservations no longer receive IP addresses from the server.
The Service Pack 4 release includes several quality improvement fixes to correct known Dynamic Host Configuration Protocol (DHCP) problems. One was to check for invalid database records that contain out of scope IP addresses. Unfortunately, this also includes "Out of Scope" reservations which are legal.
To resolve this problem, obtain the latest service pack for Windows NT 4.0 or Windows NT Server 4.0, Terminal Server Edition or the individual software update. For information on obtaining the latest service pack, please go to:
Microsoft has confirmed that this is a problem in the Microsoft products that are listed at the beginning of this article. This problem was first corrected in Windows NT version 4.0 and Windows NT Server 4.0, Terminal Server Edition Service Pack 5.
For more information about changes to DHCP in Service Pack 4, please see the following articles in the Microsoft Knowledge Base:
(https://support.microsoft.com/kb/184693/EN-US/ )DNS/DHCP/WINS Release Notes for Windows NT 4.0 SP4 Update
(https://support.microsoft.com/kb/196066/EN-US/ )Limitations Creating DHCP Reservations