XtendLan XL-ICA562M1CIR, User Manual

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3.4 Cautions for Network Setting
If the firewall is used for security purpose, the unit may not work properly.
In this case, open the port of the unit, then it will work properly(Refer to the manual of IP sharing
device).
The port being used by the unit can be checked on 'Port Setting' of 'Network Setting' of
'Administrator's Page'.
Port of the ex-factory is set default as follow;
In setting user port, do not use from 1600 to 1670, which port is used in the unit itself.