I have just setup a Windows 2003 Domain controller. I have installed AD, DHCP and DNS. I have approx 25 Win XP machines. I noticed that the machines were slow to log on so I checked out my DNS which all seems to run OK. If I ping the server name or IP of the server it resolves it OK, but if I do a NSLOOKUP it comes back with cannot find server. Also on some of the workstations it cannot find the Domain controller. All the DNS settings look OK. I also have another network with exactally the same server on and 300 workstations and that is fine, it does the NSLOOKUP no problems. I think the problem obviously lies with the DNS but I am coming to the end of my knowledge. I have the server pointing to its own IP and I have set the workstations to manually point to the DNS server but to no avail.