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Here are a few things you can try to troubleshoot the issue with the chat socket failing to connect from the frontend to the socket server:
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Double check that the socket server is running and listening on the correct port (3001 based on your config). Try telnetting directly to the server on that port to verify.
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Make sure the nodejs chat server is binding to 0.0.0.0 or localhost, not 127.0.0.1. It needs to listen on all interfaces.
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Check the browser console for any errors or connection failures. This can provide clues on where the issue is occurring.
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Try simplifying the proxy config for the /socket location. Remove extra headers like X-Real-IP etc and see if the basic proxying works.
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Verify that websockets are enabled in the nginx config using proxy_http_version 1.1; and proxy_set_header Upgrade $http_upgrade;
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Check that the EC2 security group allows incoming connections on port 3001 from the frontend subnet/IP range.
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Look for any CORS or protocol mismatches between frontend and backend. They should use the same protocol (HTTP vs HTTPS).
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See if connecting directly to the socket server URL from the browser works rather than going through the proxy. This can determine if Nginx is the issue.
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Check Nginx error logs for any clues on connection failures or proxy issues.
Hey Adeleke, Thanks for the response, we have tried everything that you suggested here but it's still not working. Let me know if I can share something with you which can make it easier for you to help us