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.
FASTECHSAsked:
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remixedcatCommented:
have you checked all group policies?
Ernie BeekExpertCommented:
'like clockwork'
Any tasks running at that time?
remixedcatCommented:
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.
sumeshbnrCommented:
getting an IP address ? Which class IP the same NW? have you tried changing your NIC?
Anurag_TiwariCommented:
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)

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