VM Network Connection Goes Idle Unexpectedly

I have Hyper-V setup on Windows Server 2008 Enterprise in server with two physical network adapters.   I have a Standard 2008 virtual machine running as a guest on the Enterprise host machine.  The host machine has it's own dedicated network adapter.  The guest virtual machine is configured to talk to a virtual external network configured on the other adapter in the host physical machine.  

After a period of user inactivity, the network connection on the guest os stops responding.  The host os responds just fine.  I can log into the host, open the Hyper-V manager and connect to the guest os.  The guest os shows low processor utilization and appears to be up.  However, The guest os does not start talking to the network again until I do something to manually "wake up" the network connection i.e. browsing the web from the console, even pinging from the command line.   If I open an application that is not network related before initiating something network related, it DOES NOT wake the network connection.

Any and all thoughts appreciated.  Thanks in advance
bebersAsked:
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bebersConnect With a Mentor Author Commented:
Update:

I created a simple batch file to ping a remote host and scheduled it to run every 15 minutes.  This seems to keep the connection alive.   This works but I would prefer to get to the root of the problem.

Any ideas? Thanks again.
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kumarnirmalCommented:
Please check the Power Options Configuration of the Virtual Machine and also check whether the option "Allow the computer to turn off this device to save power" is enabled under Device Management Options of the Virtual NIC.
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bebersAuthor Commented:
Power configuration of both VM and physical host are set to High Performance.  

"Allow ... turn off..."  on the physcial host NIC dedicated to VMs is unchecked (This shouldn't require a reboot of the physical host??)

There is no "Allow ... turn off ..." option on the VM virtual NIC device manager.
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