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
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:
DNS/DHCP/WINS Release Notes for Windows NT 4.0 SP4 Update
Limitations Creating DHCP Reservations