I have the latest Airport Extreme and am trying to share a FAT32 partition on a USB drive over the internet. The internet portion of the base station is working fine and I can see and use the shared disk with Apple's Airport Disk utility when I'm on the same network as the base station. However, when I goto another WiFi network, I cannot use Finder's Go->Connect to Server->my external cable internet IP or Window's mount network drive to see the shared disk. I also don't see any option in the Airport Disk utility to do this. I can get to the base station fine, because Finder for example lets me connect to the external IP of the router - it just doesn't show any volumes to mount. My base station has share disk over WAN enabled. I have tried with disk password and user accounts as well as a test with guest access enabled. No luck. I want to eventually configure it so I can backup files from work to the hard drive at home. Any thoughts?