I was trying to do a reverse dns lookup for one of our Windows 7 machines and it fails. The nslookup with the host name works without a problem. I looked at DNs and see that their is no entry in the reverse lookup zone for our windows 7 clients. Why is this? The DNS A record has the option to update the asocaited ptr record selected. I tried removing it form DNS and running an ipconfig /regiosterdns form the Windows 7 workstation with the same results. Is there a way to resolve this so reverse dns lookups work?