[Andrew9999]

I use a Fritz!Box for the Internet router.  Under "Permit Access" I configured "Port Sharing" settings.  Specifically, I permitted access for TCP port 48,000 only on the PC running MobileSheets, and assigned the same port externally.  The Fritz!Box confirmed that the port was shared for this device.  I then set up an inbound firewall rule on the PC allowing TCP and all ports for the MobileSheets exe.  Then I used my public broadband address (which is static) as the address on a remote tablet attempting to connect using "direct connection".  After a time the tablet timed out with the message "unable to connect".