Unable to Access Server between 11 PM to 7 AM

Hello

I have windows 2003 Server, I am facing some strange issue with my Server only in Night, we are Unable to Access Server between 11 PM  to 7 AM also unable to Ping from LAN if i will change change the time manually to 8 am then it will give access and reply of ping and can access my Server,  I did spend  lot's of time to troublrshoot for this but  I didn't get any Success

Please  Help to us

Please help

Nilesh
Nilesh HavireBusiness ITAsked:
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Maen Abu-TabanjehNetwork Administrator, Network ConsultantCommented:
please  check event viewer for this application at that time? must be something wrong , check also schedule task's its possible there is update task running or on the application itself its stop working from time to other. ...what the name of this application?
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ChiefITCommented:
Are you trying to communicate with the server on the same subnet and broadcast domain, or through a remote connection and over the router.

You see, there is a means to block traffic via time through a time-based ACL. That blocks traffic using a proxy or a router to prevent traffic during certain times. So, it is important to determine if this issue happens locally as well as off site.

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ChiefITCommented:
Here's an example of a time based ACL::

http://ardenpackeer.com/security/tutorial-time-based-acls/
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Windows Server 2003

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