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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.
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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