I've solved it. It's not the size of the ram issue - in fact i set my vm to 1gb now. The issue was that 16261 is not just udp, but it's tcp too... wasted 2 days just for this edit: i spoke too soon, all of a sudden it was responding, and now it isn't! edit: solved, Kaspersky Internet Security was the cause of the issue on Windows 10 (not a problem on win7) - uninstalled it