This morning I received some calls about users receiving a popup with the message "Windows had detected an IP address conflict". I looked at our DHCP server and there are several IP address which are marked as "BAD_ADDRESS" "This address is already in use".
I went to a couple of the affected computers. I checked the DHCP server and they are pointing the correct one. I Then did an ipconfig /release and an ipconfig /renew and they acquired the same IP address and they are still marked as BAD_ADDRESSES in DHCP. The computers seem to be running fine with the exception of occasional popups.
I can ping the computers, I have run scans on the IP address from NMAP and I did an ARP scan which only finds one host per IP.
Any idea what would cause this, how to identify the duplicate IPs or how to resolve it?