Technical information

Network Security White Paper ver. G.1.2
Page 45 of 72
FTP 21 Y Y Y Y
Setting FTP to down closes
FTP port (21/tcp). The FTP
server service will be down
but the FTP client function is
still available. Therefore, if
this function is down, Scan to
FTP is still available.
SSH/SFTP 22 Y Y Y Y
If either of ssh or sftp is set to
down, this port will be closed.
TELNET 23 Y Y - -
Telnet cannot be disabled via
mshell for obvious reasons.
SMTP 25 Y - - -
Configuration > E-mail >
Reception Protocol > ‘POP3’
or ‘IMAP4’.
HTTP 80 Y Y Y Y
Setting ‘web down’ does not
close this port. In order to
close this port open mshell
and type ‘set http down’.
In order to close this port via
Web Image Monitor, it needs
to be connected via HTTPS or
IPv6.
IPP 631 Y Y Y Y
NBT 137/138 Y - Y -
Setting NBT to down closes
NetBIOS-NS (137/UDP) and
NetBIOS-DGM (138/UDP)
SMB 139 Y - Y -
Setting SMB to down closes
NetBIOS-SSN (139/TCP).