What you need to do is:
1: specify the port number in WCM ie 6443
2: login to your linksys router and use the port forwarding option to forward requests on your external (*Publicly routable) address to the internal address of the machine running WCM for the specified port.

** there is also a DMZ option in most routers. You can also put the ipaddress of the WCM machine in the DMZ, but beware it makes that pc almost as if it were on the connection with out the router. ie possibly vulenerable.

Then to connect remotely you would open Window Media Player on the remote machine goto open url, and type ' mms://ipaddress_of_router:port#