Error Message:

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The DHCP service issued a NACK (negative acknowledgement message) to the client, computer name, for the address, address.

Explanation:

This NACK happens when you have multiple DHCP servers and one of the DHCP servers with Windows NT 4.0 Service Pack 2 runs out of available addresses. If the server gives out all the available addresses, and then receives a DHCPREQUEST from the offer of another server on the same segment, it will send a NACK in response to the request. NOTE: This problem might occur intermittently and will not show up if the second server responds before the DHCP server with Service Pack 2.

User Action:

Verify that the configuration is correct on both servers.