We have just been working on a niggly problem. We were trying to connect a spare nic in a Server 2008 server to a development network. The development network is currently just a switch with nothing else connected.
As soon as the second nic was plugged in, we lost all connectivity to the server from the main nic, and even lost ability to ping the server.
After a bit of head scratching we realised that although Windows Firewall was turned off, as soon as the second nic was plugged in the Firewall turned itself back on.... thus blocking pings and RDP.
Simple solution was obviously to plug in the connection, and then disable firewall.
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