We are having an unusual issue with DNS/DHCP on our Win2k3 domain controller. We have several static IPs which are used for database servers in our organization.
However, even though the individual NICs on each machine are configured statically and with the proper setting, our DNS server keeps changing its A record for one of our servers and handing out a DHCP address. This breaks connection for our end users as they connect to the database by FQDN. We forcibly deleted the incorrect record and re-added the correct static record. Additionally, we made sure the static IP is reserved in DHCP and will not be handed out. We went so far as to set the expiration date on the static A record thousands of hours into the future.
However, within 15 minutes the record had been changed once again and while we can get it to stay static for that amount of time, it keeps reverting. We have flushed the DNS cache several times and also cleared the DNS cache on the end user workstations, to no avail.
This issue first took place following routine server room maintenance on Friday 11/26. Neither of our domain controllers were modified in any way (the move was reorganizing some cabling and routers).
Neither myself or my co-administrator have seen this issue before. Any help is much appreciated!