You need to open up your firewall and router to allow the outside world to reach inside your home network.
Read the fine manuals for your firewall and router to find out how you do this.
It involves opening up the port used by the content server, by default 8080 I belive.
Also you may wish to get an account with some dynamic dns service, if your router doesn't have a fixed IP from your ISP.
Also see:
https://www.mobileread.com/forums/sho...d.php?t=169202