showing 502 Bad Gateway after successfully setup nginx on virtual machine

Question

setup the nginx on the azure virtual machine. its worked fine for 5 to 10 minutes later then showing the error 502 Bad Gateway

---

nginx/1.18.0 (Ubuntu)

Answer 1

H

Will start with couple of steps about you environment

The first step is to check the Nginx error logs for any specific error messages that might indicate what's wrong. These logs are often located at /nginx/error.log on Ubuntu systems.

Look for any recent entries that occur around the time you receive the "502" error. The messages here can give you a clue about what's going wrong

Since the error suggests Nginx cannot communicate with your backend service, ensure the service is running correctly, just like:

sudo systemctl status php7.x-fpm

If you're using Nginx as a reverse prxy, these settings adjust the buffering of responses from proxied servers, Try to Increase the prxy Buffer Size

proxy_buffer_size   128k;
proxy_buffers   4 256k;
proxy_busy_buffers_size   256k;

If you're using FastCGI (common with PHP-FPM), these settings adjust how Nginx buffers the response from the FastCGI server:

fastcgi_buffer_size 16k;
fastcgi_buffers 4 16k;
fastcgi_busy_buffers_size 32k;

Get in touch if you need more help with this issue.

--please don't forget to "[Accept the answer]" if the reply is helpful--