PHP socket LAN cannot be accessed

I wrote a socket in php, and there is no problem accessing it from the same PC. But if I put the server code in another PC on the LAN, I cannot access it. I have tried many times

I captured the packet and looked at it. The packet has been sent to this machine, but the PHP SERVER shows that it has not been received

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I wrote a socket in php, and there is no problem accessing it from the same PC. But if I put the server code in another PC on the LAN, I cannot access it. I have tried many times

I captured the packet and looked at it. The packet has been sent to this machine, but the PHP SERVER shows that it has not been received

Forgot to turn off the Japanese firewall