Recently I have been getting NACK errors in my event log and renewing my lease has been a major PITA. I dont know what is going on here. I know the error can happen with 2 DHCP server son different subnets. I have 2 subnets but the second subnet is all static IP addresses and no server let alone DHCP server (on that subnet). I reinstalled SP6a on my DHCP server and rebooted and it seemed to solve the prob for a couple leases but every time someone tries to renew a lease it gives the client an access denied error and wont renew the adapter. Then I have to reboot the server. This is getting old as the the DHCP server is also a file server and kicking people off their files to reboot is not cutting it! Any ideas fellas????