Knowledge Base

WordPress websites on a Plesk server show “404 Not Found” when PHP-FPM by Nginx and Proxy Mode are used

Symptoms

Website pages based on WordPress show below error on all pages except the main one:

404 Not Found

when:
- FPM application served by nginx is set in Domains > example.com > PHP Settings
- Proxy Mode is enabled at Domains > example.com > Apache & nginx Settings.
- Non Plain is set in WordPress Dashboard > Settings > Permalinks type
WordPress REST API point (wp-api) shows 404 error. It can be checked by accessing http://example.com/wp-json/wp/v2/posts

Cause

WordPress detects that php files are handled by Nginx and doesn't generate .htaccess file. At the same time permalinks continues to be served by Apache when Proxy mode is enabled.
Since .htaccess with Apache rewrite rules doesn't exist WordPress shows 404 error for pages.

The behavior that PHP continues to be served by Apache when Proxy mode is enabled is considered a bug with the ID #PPPM-11234.

Resolution

One of below workarounds can be used:

Switch PHP handler to "PHP-FPM served by Apache" (preferred workaround)

Log into Plesk
Go to Domains > example.com > PHP Settings
Set PHP FPM application served by Apache and click on OK
Go to Domains > example.com > WordPress > Log in
Go to Settings > Permalinks
Click on Save Changes

Via Plesk GUI(using `.htaccess` file)

Log into Plesk
Go to Domains > example.com > File Manager > httpdocs
Create the .htaccess with following content:

# BEGIN WordPress
# The directives (lines) between "BEGIN WordPress" and "END WordPress" are
# dynamically generated, and should only be modified via WordPress filters.
# Any changes to the directives between these markers will be overwritten.
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteRule .* - [E=HTTP_AUTHORIZATION:%{HTTP:Authorization}]
RewriteBase /
RewriteRule ^index.php$ - [L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /index.php [L]
</IfModule>
# END WordPress
Click Save button

Via SSH(using `.htaccess` file)

Connect to the server via SSH.
Create /var/www/vhosts/example.com/httpdocs/.htaccess with below content:

# BEGIN WordPress
# The directives (lines) between "BEGIN WordPress" and "END WordPress" are
# dynamically generated, and should only be modified via WordPress filters.
# Any changes to the directives between these markers will be overwritten.
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteRule .* - [E=HTTP_AUTHORIZATION:%{HTTP:Authorization}]
RewriteBase /
RewriteRule ^index.php$ - [L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /index.php [L]
</IfModule>
# END WordPress