Client Internet Access Issue

Hi,
I just set up a leopard server 2 days back and everything seems to work properly. It is behind a router/switch. I configured my MBP as a directory client and that went fine too. Expect I'm having issues while accessing certain things:
1) Mail can't access the Gmail IMAP server and other external servers, It DOES connect to the leopard server's mail service.
2) Adium looses connection to AIM/MSN etc.
3) I cannot access any web sites in Safari (Amazingly enough I found out that I can access Wikipedia.org but can't go to any other sites, even Apple.com doesn't work) this shows there is internet connection but leopard is acting goofy.
Interestingly, Transmission works fine... It downloads & uploads torrents perfectly fine.
Windows machines on the network seem to work fine. only Leopard clients are acting up.
I tried making a VPN connection to the leopard server from my MBP and then I can access everything. But it's not the solution I'm looking for since VPN connection drops every now and then. Plus it doesn't really make sense to make a VPN connection while you're on the LAN.
Any ideas what's wrong? How to go about solving this issue. This is my first Mac Server so I'm out of ideas.

The Mac clients automatically configured themselves to use the Leopard server as the DNS server... which was causing the issue... properly delegated the DNS and everything is up and running!

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