Other Network Settings
Set the following according to your network environment.
Setting the PASV Mode of FTP
PASV is an FTP communication mode that is used during file transfer. Press <On> for this setting to enable the machine to connect to an FTP server even if the machine is within a firewall. Confirm beforehand that the PASV mode is set on the FTP server side.
(Settings/Registration) 
<Preferences> <Network> <TCP/IP Settings> <Use FTP PASV Mode> <On> <OK>Setting HTTP
Select <On> to use the Remote UI and Department ID Management PIN confirmation.
(Settings/Registration) <Preferences> <Network> <TCP/IP Settings> <Use HTTP> <On> <OK>Setting a Proxy
Select <On> to connect the network via a proxy server. Using proxy authentication makes communication more secure.
(Settings/Registration) <Preferences> <Network> <TCP/IP Settings> <Proxy Settings> <Use Proxy> is set to <On> Specify each setting <OK>