DNS issues when shutting down last 2003 Server

We have our 2003 domain up and running for years. I have run Forest and Domain prep. I now have (3) 2008 AD / DNS servers running. My last 2003 server is ready to be shutdown. It was an AD server. Ran DCpromo on it to remove the AD roles. Now it just sits there. No file shares. No DHCP. No AD. It seems to be the key to our whole building getting out to the internet. Every time I shut it down the users (about 100) can't get to the internet for the most part. Some can once in a while. Some pages (very few) load but slowly. most just can't get out at all.
I have physically been to each machine and all DNS setups point to the new 2008 servers. We don't run any type of proxy so it was not a proxy ever.
I just ran a packet capture and the 2003 server is doing DNS Query and Response to my 2008 boxes and a few users PC's.

Any ideas as to what I am missing?

Thanks
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zuleaAsked:
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JamesMcBrideCommented:
how do your 2008 boxes do DNS resolution? are they set with forwarders to the 2003 box? do they do it recursively?
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zuleaAuthor Commented:
I just looked in the properties for all of my 2008 boxes DNS. They all have 2 Ip's in the forwarders tab. both are old servers one is the one in question.
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JamesMcBrideCommented:
I reckon that's your problem then!

I'd set them to something public (assuming you have the appropreate firewall rules in place) I normally use google - 8.8.8.8 and 8.8.4.4
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zuleaAuthor Commented:
Thanks. I made the changes. i also checked the box for use root hints if forwarders are not available. I will let you know how it goes shortly.
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zuleaAuthor Commented:
Well that did the trick. The first forwarder was actually a server that had been shut off for months. So that was slowing things down right there. We are faster than we have been for a long time surfing the web.

Thanks!
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zuleaAuthor Commented:
Fast and easy answer! Awesome!
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