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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.
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.
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:
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.