WP Toolkit is Broken after attempt to install Redis Fatal error: Uncaught RedisException: Connection refused in /var/www/vhosts/example.com/httpdocs/wp-content/object-cache.php

Batyr Tarpakov

Updated September 18, 2025 05:10

Plesk for Linux kb: technical

Applicable to:

Plesk for Linux

Symptoms

WP-based website has an error in the logs:

CONFIG_TEXT: Fatal error: Uncaught RedisException: Connection refused in /var/www/vhosts/example.com/httpdocs/wp-content/object-cache.php:726
WP instance URL can point to an incorrect domain, Plesk > WordPress > example.com > three dots in the right corner > Update site URL does not fix it
WordPress installation is shown as broken in WordPress > example.com
There was an attempt to install Redis_Cache either via the WordPress admin console or WP Toolkit

Any attempt to restore the site from the previous backup completes, but shows the same error in the restore log file

Cause

Redis cache is currently not supported by Plesk, and therefore, it is also not supported by the WP Toolkit in Plesk.

If you would like to see this feature in future versions of Plesk, please take part in our product improvement by submitting a feature request here.

Resolution

1. Log into Plesk

2. Use the File Manager in Plesk to rename the file /var/www/vhosts/example.com/httpdocs/wp-content/object-cache.php to /var/www/vhosts/example.com/httpdocs/wp-content/object-cache.php-bk

3. Go to Plesk > WordPress > example.com and press the Refresh button: