We already have ISPConfig3 set up in an Nginx-only environment. ISPConfig3 is installed on an Nginx server and it manages two other Nginx web servers, one of which is a mirror of another. We are getting requests from customers who want to use Apache instead. Is it possible to introduce Apache into this configuration? That is to say, can we use our existing standalone ISPConfig3 running on Nginx (as a "management server") to manage new Apache servers that we add? We wouldn't be trying to mirror any of the existing Nginx servers to these Apache servers or run any of the existing sites already configured for Nginx on the new Apache servers. We would just like to use the existing ISPConfig3 management console to manage both Nginx and Apache to give our customers a choice of underlying web servers without having to set up a separate ISPConfig3 console for the Apache servers. I can't seem to find anything that says you can or can't either way. Any insight would be appreciated. Thanks!