I'm not sure I fully understand your setup:
- do you try to use RNDIS (internet over USB) for Edison?
- have you set the IP 192.168.2.15?
- can you ping that address at all?
Don't have Edison running right now but I think the IP address for RNDIS on Edison looks differently so you might have to select a different address on the Windows side (same subnet as on Edison side) in order to communicate
Maybe you could post USB ethernet settings as well as "ip a" on Edison side?