Thecus N2310 series User Manual page 49

After the router has enabled "UPnP Service" then you will have information come from associated
router to UPnP port management as shown in the screen shot below.
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".
Chapter 3: System Administration
43