It would be a nice enhancement to allow the user to change the default port. So, instead of 5201 for the Slingbox 500, you should be able to switch the port of the Slingplayer to something else. That way, you can configure your router to use a 'safe' port (e.g. 80) and push it internally to port 5201. That would help the case where you are behind a corporate firewall and cannot use a proxy.