Hi,
There was a problem before, which I believe it was resolved 1 or 2 months back.
Screen capture and post your configuration page here.
You can access from local WiFi and not from your 3G. Unlikely you can access from outside WiFi.
I guess your Buffalo registered itself to Buffalonas.com, It is likely that your Netgear port forwarding is not complete.
Upnp probably wasn't working for your Netgear, so sklp auto UPnP and try manual configure. Port forward 9000 to your Buffalo NAS IP.
You are near to getting it complete :)