nginx - [win7] Port 80 can be accessed by this machine, but cannot be accessed by other machines on the same intranet. It is not occupied!

Question

System: WIN7

Server: nginx1.7.11

Problem Description:
Port 80 can be accessed by the local machine (localhost || IP), but cannot be accessed by other machines on the same intranet (through the local IP address). Port 80 is not occupied.
Change it to another port, and the IP port number can be accessed.

Set up a free wifi on this machine and change the configuration (server_name localhost 172.27.23.1;). It can also be accessed through the free wifi gateway address (172.27.23.1). It just cannot be accessed through the local IP address and the default port 80!

Checked the firewall, all are closed! Find the solution!

Answer 1

Same intranet and same network segment?
Check it with traceroute.