Forwarding port 9000

I've tried doing this on my router

How do I test this within my network or do I have to be external for it to work if so, what do I need to do to test it?

Thanks

What is the application your wanting to enable port 9000 which is cslistener?

Hi, it's a Buffalo Linkstation pro. Enables webaccess to the hard drive outside of my network.

Here's what I've done:

Set up a service > Add Custom Service
Name: LINKSTATION
Tyoe: TCP/UDP
Start Port: 9000
End Port: 9000

Then gone to Firewall > Inbound Services
Service: LINKSATION
Action: Allow Always
Send to LAN server: 192.168.0.130
WAN Users: Any
Log: Always

Thanks