On the ispconfig main panel of a site one may select if php is served in which mode. Options beside others are php-fcgi and php-fpm. One site may run php-fcgi, while another may php-fpm. So far, so well. When changing the php mode for a site from php-fpm to php-fcgi, the site's call ends with 5xx errors, because the socks file is not found. Indeed, the webxx.socks file is vanished because of the change, but php-fcgi normally has no need for such socks file. Restartung apache2 and php-fpm does not help. The problem remains. Does somebody experienced similar observations? (Using ubuntu 18.04, apache2, multi php (7.3,7.4,8.0) and sure ispconfig latest prod).