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I have tried refereshing DHCP credentials for Domain Admin in advanced tab but no luck.

No error is logged in the event viewer of either the client and the server.

NT 4.0 Then go to Advanced Tab: DNS dynamic updates registration credentials - Credentials, and set credentials from which name DHCP will be updating DNS records.

(without this it won`t work) Alexey There are a couple of ways this can happen; there are pros and cons to each approach.

Using Netflow, I could see the ip address of the offender but couldnt see the hostname of the computer/workstation that was the offender.

Here is my config for DHCP on the switch -ip dhcp pool PC network 10.1.70.0 255.255.255.0 domain-name dns-server 10.1.1.1 10.1.1.2 default-router 10.1.70.1 lease 8This is an office across the street from the main building.