Thecus N2520 series, User Manual

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Chapter 3: System Administration
And click “Add Rule” to add more port mapping from Internet to access desired services or press
“Refresh” to get most updated list.
A description for each item as following:
UPnP Port Management
Item Description
Start port Specific port number starts with.
End port Specific port number ended
Protocol Choose the protocol for port forwarding needed.
Description Specific the port services if applicable.
Apply Click “Apply” to confirm the changes.
Cancel Click “Cancel” to abort the changes
Some of the routers do not allow the input of port number below 1024.
So it may have resulted “setting fails”.