How to diagnose network problems on Windows 10?

Question

Computer networks

Created a network through the standard customizer.
Computers are visible, but there is access to the computer from the laptop, but it does not allow access from the computer to the laptop. It gives a message that there is no access and offers to diagnose the network, but the diagnostics show nothing.
Computers in one subnet, judging by their IP. The D-Link 2640 router distributes addresses via DHCP.
Shared resources on both.
How to diagnose, what to adjust?

Answer 1

Check the firewall settings on each side.
Check how the network was classified (home, work, etc.) by each side.

Answer 2

to the edge of the service lookb Server