upstream connect error or disconnect/reset before headers. reset reason: overflow
The error “upstream connect error or disconnect/reset before headers. reset reason: overflow” means a connection between your web server (like Nginx) and a backend server (like a PHP-FPM) failed to establish or was prematurely close
Here’s a breakdown of the issue and potential solutions:
What the Error Means:
- Upstream:
Refers to the backend server that your web server is trying to connect to.
- Connect Error/Disconnect/Reset:
Indicates that the connection between the web server and the backend server failed or was terminated before the backend server could send the response headers.
- Before Headers:
The error occurred before the backend server could send the HTTP response headers.
- Reset Reason: Overflow:
This suggests the backend server is overloaded or has run out of resources, causing it to refuse the connection.