Today I set up a new Windows Server 2012 R2 installation. I then went home, planning to continue managing it via VPN. When I connected to the network, though, I couldn't reach the server. It responded to ARP queries, but couldn't be pinged or connected to in any way. I concluded that it had gone to sleep, and that the network card had ARP offload enabled. I tried Wake-on-LAN, but it evidently was not enabled.
So, I guess Windows Server can go into power-saving modes by default. That seems like an unusual choice, considering that servers are expected to continue serving requests in the absence of a user at the console.
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