Websocket is Not Working over wired point to point LAN

[mznr]

I am using okhttp with StompProtocolAndroid to connect an android device to a PC using websocket. The websocket server has been developed by Springboot.

It is working fine when I run the client app on emulator. When I run the app on a real android device which is connected to the same Wifi network that PC is connected to, it works fine too. The problem arises when I connect the android device to the PC with a cable and set IPs for both sides (For example: PC Ethernet IP: 192.168.4.1 and Android Device IP: 192.168.4.3). In this case android device can not connect to the server.

What should I do in this case?
Is any extra configuration required when the device and the PC are connected by cable (not by wifi)?

Please Help me.

Thanks.