Switching a server from apache to nginx is not supported as it will break the server and all sites. If a server is apache or nginx is detecetd by the install.php script and not update.php script for that reason, so if you want to switch this server to ngix, then format the server, delete the server record for this server in the master ispconfig database and then reinstall it as described in the nginx guide and assign it again to the master server.
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