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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?

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Can you connect to RDP using FQDN? If so, sounds like your Win7 machine hasn't picked up a DNS suffic from your DHCP server. Is your dhcp server handing them out? Check using ipconfig, you should see it listed under there. – Jon Angliss Sep 10 '11 at 19:51
Can't connect to RDP via IP/FQDN to the DNS/DC/DHCP server. However, I can connect to everything else via IP. It's pulling a DHCP address, the gateway is correct and the DNS server. – cole Sep 10 '11 at 19:53
If you manually enter the Windows Server 2003 in your Primary DNS, what happens then? – user3914 Sep 10 '11 at 21:19

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.

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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.

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