I have an 4 pcs networked, XP, Vista, Win 7, and Win 10. I'll number them to alleviate confusion.
Win 7=machine 3
Win 10=machine 4
M1 can connect to M2 and M4
M2 can connect to M1, M3, and M4
M3 can connect to M2 and M4
M4 can connect to M1, M2, and M3
So...M1 and M3 do not connect or see each other at all. I have disabled all firewalls. They have worked together for years.
Any ideas why this just changed and how to fix it?