Network Disconnects 6:59pm and 8:00 AM CST

I am having a very bizarre issue with only one computer on my network. We are running windows 2003 server. My computer is setup with gigabit ethernet to a trendnet 16 port gigabit smartswitch. Only one of my computers is having this problem. What is happening is almost clockwork around 6:59 I lose my network connection. I am getting an ip address but can't get on the internet or the server. If I wait about 30 minutes then my connection is back. I have no clue what or why this is happening. My computer is pointing to the server for dns.
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.

have you checked all group policies?
Ernie BeekExpertCommented:
'like clockwork'
Any tasks running at that time?
scheduled tasks... please check them.... someone could have done it to have it disconnect after a certain time to get themselves to go to bed if they are hard to pry themeselves off the computer.
getting an IP address ? Which class IP the same NW? have you tried changing your NIC?
It seems only Internet stop working at that time.It seems to be some policy related to your proxy server usage.It would be worth to have a look on ISA Server part(assuming ISA would be in your environement for internet access)

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
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
Networking Hardware-Other

From novice to tech pro — start learning today.