Hot answers tagged wp-config
Yes, you can set the WPMU_PLUGIN_DIR constant in the config file of each of the sites (and WPMU_PLUGIN_URL for the url). By default it is defined as: WP_CONTENT_DIR . '/mu-plugins'
Try to create a symbolic link within wp-content for each site: ln -s /root/mu-plugins mu-plugins
I had the same problem and solved it by moving the two define statements up before the require_once that includes wp-settings.php. Seems this was the issue all along. Source: http://stackoverflow.com/a/27193576/117268
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