Click the server for which you want to enable HTTP
In the details pane, click the Properties tab.
In Category, click Control protocol.
In Plug-in, click WMS HTTP Server Control
Click the Enable button.
If Windows Media Services and Internet
Information Services (IIS) are installed on the same computer, be
sure each service has been allocated a unique HTTP port. By
default, both services will attempt to bind to port 80, which
causes a port conflict. You can resolve the port conflict by either
adding IP addresses to your server or by changing the port that
Windows Media Services uses for HTTP streaming.