Fix “503 Service Unavailable” When Uploading in Stackposts (aaPanel + Nginx + PHP 8.x)

💡 Summary

Fix 3 parts:
① PHP → increase upload & execution limits
② Nginx → raise timeouts & file size limits
③ PHP-FPM → increase workers and request timeout

✅ Step 1 – Configure PHP

In aaPanel → App Store → PHP 8.x → Setting → Configuration, set:

→ Click Save → Restart PHP 8.x

✅ Step 2 – Configure Nginx

Open your domain config file:

and add (or update) the following inside the server { ... } block:

(replace 8x with your PHP version, e.g. 80, 81, 82, 83)

→ Save → Restart Nginx

✅ Step 3 – Configure PHP-FPM

Open:

Find the [www] section and ensure:

→ Save → Restart PHP 8.x

✅ Step 4 – Test

1. Open info.php → confirm php-fpm: active.

2. Upload an image or video in Stackposts → ✅ No more 503 Service Unavailable.