You need to used the avoidance webaccess setup as the UPNP is not working correctly, Login go to webaccess, setup your Internal to be 9000, Your external can be whatever you want from 1500-65000 so as long as the port is not in use. Disable UPNP as well, Then go in to your router, Make a port forwarding rule and add the IP of the Terastation or Linkstation to the DHCP Reservation or if you have a static IP that will work to.