Resolved Wordpress subpages returning 404 (index.html) error after nginx restart

[PrimeSites]

Server operating system version

Ubuntu 20.04.5 LTS

Plesk version and microupdate number

Plesk Obsidian 18.0.47 Update #5

We have an established site that have been returning errors since an nginx restart.
The homepage loads fine, but any sub-page / post returns a 404.
Logs showing entries like e.g.:
(nginx error) 23886#0: *1 "/var/www/vhosts/working.dir/example.com/whats-on/index.html" is not found (2: No such file or directory).
Any help much appreciated.

 

[PrimeSites]

I've taken a clone of the site (via WordPress Toolkit) on a subdomain and the clone works fine, with all sub-pages loading as per normal.
Comparison between the original instance (with problem) and cloned instance show no differences for:
- PHP Settings
- WAF
- SSL/TLS Certs
- Apache & Nginx Settings

 

[PrimeSites]

PHP version is 8.1.12. Changing from "FPM app served by nginx" to "FPM app served by Apache", followed by nginx & Apache restarts did the trick.
Website has now returned to normal operation.

 

[Bitpalast]

When you use PHP via Nginx you also need to transcribe the .htaccess rewrite rules that your site uses and place them into the "Additional nginx directives" section of your configuration in nginx syntax. Please see this article for more information:

After switching a website to FPM served by nginx in Plesk, it fails to load with "404 Not Found" on all pages except start page

Applicable to: Plesk for Linux Symptoms After setting PHP for a domain as FPM application served by nginx in Plesk at Domains > example.com > PHP Settings, only start page is loading in a...

support.plesk.com

 

[PrimeSites]

Thanks @Peter Debik, appreciate it. I did not come across that post while trying to troubleshoot.