502 Bad Gateway Host Server Not Responding (Andasy Deployment)

General
1

After successfully deploying my Laravel backend application on Andasy, I am encountering a “502 Bad Gateway error”
when trying to access the API endpoint: https://taskers-api.andasy.dev/api/open/faqs

Screenshot 2026-03-30 at 11.57.10
Screenshot 2026-03-30 at 11.57.102732×1786 215 KB

The error page indicates that:

  • The browser is working
  • Cloudflare is working
  • The host server is returning an error

Observed Behavior:

  • The application URL returns a 502 Bad Gateway error
  • Cloudflare reports Host Error
  • The backend API is not reachable through the domain

Expected Behavior

  • The API endpoint should respond successfully
  • Data should be returned from the backend without errors

I would be happy to provide more details (logs, configuration files, environment variables, or deployment settings) to help diagnose and resolve this issue more effectively

2

Hi Leon,

What steps to debug have you done? Share more details if possible.

  • Check if your app is running on the same port as the port registered in andasy.hcl
  • Check if your app is listening on ipv6 because we only connect to the ipv6 interface in you machine
  • Run andasy logs to check if you app is started or having issues starting
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3

Thank you for your guidance on debugging the 502 Bad Gateway issue. I’ve successfully resolved it!

The problem was: My application was listening on IPv4 only (127.0.0.1), but Andasy requires IPv6 support as you mentioned.

The solution I implemented:

  1. Updated Nginx to listen on both IPv4 and IPv6:
  • listen 80;
  • listen [::]:80;
  1. Switched PHP-FPM from TCP (127.0.0.1:9000) to Unix socket (/var/run/php-fpm.sock), which works seamlessly with both IPv4 and IPv6
  2. Optimized the Dockerfile to use PHP 8.3 instead of 8.4 to reduce build times and avoid deployment timeouts

Current status: Application is now running successfully on https://taskers-api.andasy.dev/api/open/faqs All API endpoints are responding correctly , No more 502 errors

Thanks again for pointing me in the right direction regarding IPv6 connectivity!

1 Like