open_basedir directive, wp_w3all will not include the necessary phpBB config file, because files inclusion is restricted to the directory assigned by open_basedir, so phpBB config file inclusion won't work.
To let wp_w3all include the config file between domains and subdomains, you need to comment off the open_basedir in your php.ini:
Code: Select all
;open_basedir =
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<Directory /var/www/vhosts/domain.tld/httpdocs>
php_admin_value open_basedir none
</Directory>