How to change the port for a virtualhost ?

[kilburn]

First of all, you have a faulty understanding of the virtual hosting system. Incoming connections go directly to some IP:PORT combination (disregarding the DNS name being used at the client side), so you can *not* open a given port from two different programs (apache+whatever).

That being said, what you need is to follow their guide on how to install mediacore in apache+fastcgi.