Today issues upstream connect error

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.