I am sorry that I borrowed the power of translator because I can not speak English well first.
I try to connect to IP by console command after I receive input IP.
The computer has a desktop A that is hooked up to the router.
And notebook B that tethered the mobile phone.
IP is accessed by entering an external IP.
If A becomes a listening server and B becomes a client
The connection from B to A is successful.
However, no connection from A to B was made.
Both the off and on state of the firewall were the same.
What are the possible reasons for this?
I can not find a solution and leave a question.