The windows XP, and Mac's can pull DHCP and use DNS from the Windows 2003 server but Windows 7 can pull an IP from DHCP but cannot resolve DNS. However, I can ping the DNS server by FQDN & IP but cant browse or connect via RDP. It won't resolve any of the other servers/workstation by name but can connect to them via IP. (Browse and RDP.)
Any ideas?
Check for Primary DNS suffix. If PC-s are in Active Directory domain, use GPO to add prefered DNS suffix. If not, try add manualy on NIC properties.
Well, looks like someone reset one of the switches to factory settings. The factory setting IP of the switch was the same one of the DNS/DHCP/DC server.