I have 3 computers on my home network, two are Windows 10 desktops, one is Windows 7 laptop. I'll call them 10-1, 10-2, and 7.
10-1 can see 10-2 and 7.
7 can see 10-1 and 10-2.
10-2 can see 7 but CANNOT see 10-1. What can cause this problem?
All are Ethernet connected to the same router.