If you use both Windows Media Services and a Web service such as Microsoft Internet Information Services (IIS) on the same server, both services will attempt to bind to port 80. You can avoid such conflicts by assigning each service to a different port. If you assign a service to a port other than 80, the network administrator must open the corresponding port on the network firewall. For more information about changing the port that Windows Media services binds to, see To change the port Windows Media Services uses for HTTP streaming.
As an alternative, you can assign additional IP addresses to the server, enabling each service to have its own IP address and still use port 80. The simplest way to accomplish this is to install multiple network interface cards on your server. However, if this solution is not possible, you can create multiple IP addresses on a single network interface card and assign separate port 80 addresses to them. You must then configure Windows Media Services and your Web service to bind to separate IP address/port 80 combinations. Windows Media Services includes a tool for assigning additional IP addresses to your services. For information on adding IP addresses to your servers, see To add IP addresses to resolve port 80 conflicts.