Win 2K3 Server loses network connectivity

I have an odd issue that I'm at a loss to figure out. On the network here I have a web server (Win2k3) and an AD/DNS/DHCP server (Win2k8). Whenever there is a power 'blip', the web server goes off line and won't respond. When I go to the server room all I need to do is to log in (it's sitting at a command prompt) and it's fine.

The servers are on a UPS, but the network gear is not (switch, router, firewall, etc)

The AD/DNS server has nothing in it's log except for the NIC card being disconnected for 3 seconds. The web server (the problem child) has the same NIC notification and several 'Application Popup: Low Battery' warnings.

There is nothing wrong with the battery, it has 8 minutes of runtime if the power fails; and that's fine for me. If I unplug the UPS it picks up the load just fine.

So... a blip in the power causes the web server to go to a login prompt and it won't server web pages until I physically log in. No screen saver is configured.

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That is an odd issue.  It seems the loss of network connectivity is causing the issue and somehow logging in wakes the server up and lets it see the network again.  I'd check drivers and make sure everything is up to date.

More importantly though, why not correct the underlying cause to the problem?  Get the network switch on a UPS.

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I would agree by getting the network equipment on the UPS as well.  Also, what has been happening in the Event Viewer?  
sgray128Author Commented:
Nothing in the event viewer, really. The NICs disconnected and reconnected, and the 'Low Battery' warning.

I'll get the networking equipment on batteries and try to test. It'll take a day.
How many NICS are available in the web server?  It's possible its a NIC issue so if you have a spare, you could try that as well.
sgray128Author Commented:
I implemented this solution, it seems to be working...
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Windows Server 2003

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