Microsoft KB Archive/198541

= Using DHCPCMD to Modify a Reservation Converts It to a Lease =

Article ID: 198541

Article Last Modified on 11/1/2006

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APPLIES TO


 * Microsoft Windows NT Server 4.0 Standard Edition
 * Microsoft Windows NT Server 4.0 Enterprise Edition

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This article was previously published under Q198541



SYMPTOMS
When you use the DHCPCMD command ADDRESERVEDIP to modify an existing reservation, error 20022 (ERROR_DHCP_RESERVEDIP_EXISTS) is returned. When you subsequently inspect the reservation using DHCP ADMIN, the reservation has been turned into an active lease. If DHCPCMD is run again to modify the lease, it works correctly and is turned back into a reservation.



CAUSE
This is a problem in DHCP server, which incorrectly handles the modification of an existing reservation, causing the reservation to be partially deleted. This results in the remaining data looking like an active lease.

Running the same command again causes the reservation to be correctly re- added.



RESOLUTION
To resolve this problem, obtain the latest service pack for Windows NT 4.0 or the individual software update. For information on obtaining the latest service pack, please go to:


 * http://www.microsoft.com/windows/servicepacks/ -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:

http://support.microsoft.com/directory/overview.asp



STATUS
Microsoft has confirmed this to be a problem in Windows NT version 4.0. This problem was first corrected in Windows NT version 4.0 Service Pack 5.

Additional query words: 4.00 dhcpadmn tcpip

Keywords: kbhotfixserver kbqfe kbbug kbfix kbqfe KB198541

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