Originally Posted by
Saab Dastard
I think it's possible that you can get that message using fast user switching, if there's still another account open on the PC. I don't use it, so can't verify it.
Yes, this is possible.
Another possibility might be internet connection sharing, if you have that enabled, especially with unsecured wifi - possibly someone else has connected to your wifi network.
No, this isn't possible (as ICS is just NAT and RRAS combined)