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When my Windows 7 desktop locks its screen due to inactivity, I am unable to connect to it remotely. After I discovered this, I tried pinging the machine, which failed.

However, as soon as I walk over to the computer and unlock the screen, I am able to both ping it and remote in again.

Why does the computer appear dead to the network as soon as the screen locks?

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Test this: If you locked it manually would the same thing occur? add info :What is the type of connection? –  Psycogeek Mar 6 '12 at 15:58
    
Is the system asleep? –  Zoredache Mar 6 '12 at 16:20
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Windows is turning off your network adapter when it locks. Go into your network adapter configuration and uncheck Let the computer turn off this device to save power. –  resmon6 Mar 6 '12 at 16:24
    
@resmon6 I'd post that as an answer. Sounds fairly likely. –  Iszi Mar 6 '12 at 16:40

2 Answers 2

up vote 5 down vote accepted

Windows is turning off your network adapter when it locks. Go into your network adapter configuration and uncheck Let the computer turn off this device to save power.

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Can't test this right now, although I have changed the setting, but marked it down as the answer because I feel it's extremely likely. I know it is unrelated to the Firewall as we have a few PCs in the office that aren't having this problem. –  Amicable Mar 7 '12 at 9:54
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Confirmed as answer! Mucho gracias! –  Amicable Mar 7 '12 at 16:47
    
I'm happy to help –  resmon6 Mar 7 '12 at 16:52

This is Not Normal Windows/system behaviour.

I strongly feel its your firewall, that is "blocking incoming packets" the moment your system is "Locked"

To test on this, disable your firewall for a short while.. Lock your desktop and see if you are able to remote connect/ping

If you are able to, then there's probably some setting within your firewall software that you need to look for that is blocking incoming connections/packets when your desktop is locked..

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