We have a Windows 7 machine that we can only intermittently rdp into or ping. We have tried this from several different machines and run into the same issue.
We discovered if you reboot the problem machine and try to ping it or rdp it it works fine. However, after some period of time it quits working and you can't get to it anymore.
We also discovered you can ping from the problem machine to another machine and once you do that you will again be able to ping or rdp the problem machine again. However, in a very short timeframe (couple minutes) it once again becomes unreachable.
Any thoughts on what is causing this or what additional info would be helpful for me to provide? Thanks.