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?

Who is Participating?

[Product update] Infrastructure Analysis Tool is now available with Business Accounts.Learn More

I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

how do your 2008 boxes do DNS resolution? are they set with forwarders to the 2003 box? do they do it recursively?

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
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.
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 - and
SD-WAN: Making It Work for You

As bandwidth requirements and Internet costs grow, businesses naturally want to manage budgets by reducing reliance on their most expensive connection types. Learn more about how to make SD-WAN work for your business in our on-demand webinar!

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.
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.

zuleaAuthor Commented:
Fast and easy answer! Awesome!
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today

From novice to tech pro — start learning today.