I have a DHCP server running on my Win2K8 R2 DC. The configuration has been in place for years, having migrated from Win2K to Win2K3 to Win2K8 R2. The DHCP range is set from 192.168.1.100 to 192.168.1.254 with no reservations or exclusions. I also push out the DNS and gateway settings. About three weeks ago one IP address in the range stopped reaching a single server on the network. By this I mean that the workstation that picked up the offending address (.147) could ping and access all other servers on the network and reach the Internet but could not ping or access one specific server. When this first appeared I assigned a static address and the problem went away. The next week I removed the static IP and renewed DHCP and there were no problems because the PC picked up an address that was not .147. Over the past two weeks the .147 address has been picked up by several different users. Each time I temporarily assign a static address to resolve the problem. I am at a loss as to what would cause one address out of 154 to stop routing to a single address. I have created an exclusion in DHCP to prevent the problem from occuring again until I find a solution. Can anyone tell me what the heck is going on?