Enable One Button Scanning From Brother MFC 7820n

The solution can be found at the Brother website for Windows XP to 7. It involves changing the Windows Firewall settings to open a port for incoming 7820n scan saves to the designated computer.

http://welcome.solutions.brother.com/BSC/public/us/ca/en/faq/faq/000000/002500/000097/faq002597_000.html?reg=us&c=ca&lang=en&prod=mfc7820n_all#step2sp2