DHCP Server of Service Pack 4 Ignores Reservations

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Article ID: 195932
This article was previously published under Q195932
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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:
  • Windows Service Pack Center -or-

  • 152734 how to obtain the latest windows nt 4.0 service pack
For information on obtaining the individual software update, contact Microsoft Product Support Services. For a complete list of Microsoft Product Support Services phone numbers and information on support costs, please go to the following address on the World Wide Web:


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:

184693 DNS/DHCP/WINS Release Notes for Windows NT 4.0 SP4 Update

196066 Limitations Creating DHCP Reservations


Article ID: 195932 - Last Review: June 11, 2012 - Revision: 2.0
kbHotfixServer kbqfe kbbug kbfix KB195932

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