POSTMAN Error - Could not get any response - laravel

I have a VPS Server where I installed Laravel-5.8 for the backend. Also, I installed XAMPP and made the Laravel Application to be on Port 8888. The VPS server is 10.10.10.7(not the real IP). On the VPS server, I tried to test using POSTMAN:
http://10.10.10.7:8888/backend/api/login
http://localhost:8888/backend/api/login
Both work perfectly on the server. However, when I tried to test using POSTMAN from an external system with:
http://10.10.10.7:8888/backend/api/login
I got this error:
How do I resolve it?

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However, when I've tried running the application over my ip address, no files load correctly and console logs the following errors for APIs net::ERR_CONNECTION_CLOSED
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Have a good day :)

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EDIT
Screenshoot-1
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This is the client setting and putty setting to connect to client.
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I have a socket.io node js application running on server on port 3001. When I access that socket connection via browser http://ip-adress:3000/socket.io/?EIO=3&transport=polling&t=1502735738006-0 It works perfectly fine.
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