A WordPress website is not accessible: ERR_TOO_MANY_REDIRECTS

Symptoms

• A WordPress website is not accessible. One of the following errors is shown in a browser:

  PLESK_INFO: The page isn't redirecting properly

  or

  PLESK_INFO: ERR_TOO_MANY_REDIRECTS

• In Mozilla Web Console or Chrome Web Inspector there are endless redirects from www.example.com to example.com and vice versa.
• The solution from this KB article did not help.

Cause

Invalid WordPress configuration.

Resolution

1. Log into Plesk.
2. In Plesk go to Domains > example.com and click File Manager and open the file wp-config.php.

3. Add the code below at the bottom of the file right before ?>:

   CONFIG_TEXT: define('WP_HOME','http://www.example.com');
   define('WP_SITEURL','http://www.example.com');

4. If the issue still occurs, open the file _wp-config.php _and change the records to records the below:

   CONFIG_TEXT: define('WP_HOME','http://example.com');
   define('WP_SITEURL','http://example.com');

   Note: This can also be done via Domains > example.com > Wordpress > Log in > Settings > General > WordPress Address (URL) and Site Address (URL).

5. Rename plugins directory via Domains > example.com > File Manager (wp-content/plugins directory) or disable WordPress plugins one by one to find the faulty one.