Dedicated Micros SD Excel Installation Manual page 123

Firewall
This menu allows the user to block access to the unit via specific network port(s).
Enable Ping Response
Table Entry
Open TCP ports
Open UDP ports
Refresh (Purple)
Enabling this option will allow an external client to receive a response
when attempting to 'ping' the unit. Disabling this option will make the
unit less visible on the network.
Up to 32 Configuration settings may be entered.
This option can identify which system TCP ports are available. If a host
tries to communicate with the unit using a TCP port that is not within the
'open' range (even with a valid IP address), access will not be granted
to the unit. The enabled ports can be a range or single port address, if
a single port is needed then enter the same port number in the to and
from section.
This option can identify which system UDP ports are available. If a
host tries to communicate with the unit using a UDP port that is not
within the 'open' range (even with a valid IP address), access will not
be granted to the unit. The enabled ports can be a range or single port
address, if a single port is needed then enter the same port number in
the to and from section.
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