I am recently having a issue where some of my XP SP3 and Win7 clients will not register themselves in DNS. I have a DHCP server running that is handing out reserved addresses. This was working fine for a long time and now I have about 10-15 clients that don't register. If I manually force them by doing a ipconfig /registerdns they will register that way, but after a few days they are gone. My server is a 2008 R2. I did a dcdiag /test:dns and everything passed. Any ideas? I looked in my DHCP server and I do have set under the DNS option to "Enable DNS Dynamic Updates According to the settings below: Always Dynamically Update DNS A and PTR records". I have unchecked Discard A and PTR records when lease is deleted. Not sure where to go from here.

I think I may see the issue but not sure why it is not affecting everyone machine in this domain. I did a IPCONFIG /all on the troubled PC and it is showing under the DHCP section that the IP is 192.168.2.1 which is my Sonic Wall (Router) when it should be 192.168.2.5 (DC running DHCP). Would that cause this issue? I need to play with the Sonic Wall and try and disable it but we have a VLAN on it segregated for devices that want to jump on our free wireless connection and not appear on the 192.168.2.x network but on 192.168.10.x instead. Let me know what you think.

Hi, Thanks for the post. Microsoft does not recommend that you install the DHCP Server service configured to perform DDNS update on a DC. Instead, install the DHCP Server service on a separate server, and not a domain controller. Thanks, MilesPlease remember to click Mark as Answer on the post that helps you, and to click Unmark as Answer if a marked post does not actually answer your question. This can be beneficial to other community members reading the thread.

I only have one Server in this domain so how else am I suppose to do this?