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NGNIX 504 Gateway Time-out

Posted on April 23, 2021

Flask

Nginx

Ubuntu 20.04

By marisadimonda

Hi, I’ve been following this tutorial

https://www.digitalocean.com/community/tutorials/how-to-serve-flask-applications-with-gunicorn-and-nginx-on-ubuntu-20-04

I’m stuck on Configuring Nginx to Proxy Requests.

Nginx error logs: 2021/04/23 18:08:01 [error] 115757#115757: *4 upstream timed out (110: Connection timed out) while reading response header from upstream, client: 80.5.115.86, server: sub.mysite.comm, request: “GET /favicon.ico HTTP/1.1”, upstream: “http://unix:/root/text_generator/textgen.sock/favicon.ico”, host: “www.sub.mysite.com”, referrer: “http://www.sub.mysite.com/”

In the browser my IP address page shows a “Welcome to nginx!” message and my website returns 504 Gateway Time-out nginx/1.18.0 (Ubuntu).

Thanks in advance I’m very stuck!

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alexdo

June 4, 2023

Heya,

It seems that your issue might be related to the upstream Gunicorn server timing out. To get past this problem, try the following steps:

Check your Gunicorn server and ensure it’s running properly. Make sure to test your Flask application using Gunicorn without Nginx as a proxy. The command should look like:

gunicorn --bind unix:/root/text_generator/textgen.sock yourapp:wsgi --timeout 120

Ensure there’re no typos or syntax errors in your Nginx configuration file. Pay close attention to the location block and the path that the proxy_pass directive is pointing to.
Restart the services - After making any necessary changes, restart both Gunicorn and Nginx using the commands:

sudo systemctl restart gunicorn

sudo systemctl restart nginx

For more information about configuring Gunicorn and Nginx, refer to this DigitalOcean tutorial: How To Serve Flask Applications with Gunicorn and Nginx on Ubuntu 20.04.

Hope that this helps!

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