When Nginx PHP-FPM is enabled, why do all pages on WordPress show a 404 error?

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There could be several reasons why all pages on WordPress show a 404 error when Nginx PHP-FPM is enabled. Some possible causes include:

1. Incorrect Nginx configuration: The Nginx configuration file may not be set up correctly to work with PHP-FPM. Ensure that the correct PHP-FPM socket or port is specified in the Nginx configuration file.

2. Wrong path to root folder: If the root folder for the WordPress site is not set correctly, then Nginx will not be able to locate the correct files and will return a 404 error. Check that the root folder path is correct in the Nginx configuration file.

3. Incorrect file permissions: Ensure that the files and directories for the WordPress site have the correct permissions set. If the files cannot be accessed by the web server, then a 404 error will be returned.

4. PHP-FPM not running: Verify that PHP-FPM is running correctly on the server. If PHP-FPM is not running, then Nginx will not be able to execute the PHP scripts for the WordPress site.

5. Plugin or theme conflicts: It is possible that a plugin or theme on the WordPress site is causing conflicts with Nginx PHP-FPM. Try disabling plugins and themes one by one to see if any of them are causing the issue.