Failed to map the port using UPnP

[mad mike]

Cannot map port 4000 to external (Internet) access port.  
After clicking on the “Use UPnP…” checkbox, it comes up with the error  “Failed to map the port using UPnP”.  
Can connect on LAN from another computer.

Have configured LinkSys router to map to external port 20404. See screenshot.

NoMachine Version 8.14.2 (8.14.2)
Computer: Mac mini
Model Identifier: Mac14,3
Model Number: MMFK3B/A
Chip: Apple M2
System Version: macOS Sequoia 15.1 (24B83)
Kernel Version: Darwin 24.1.0

Also the same problem on a MacBookAir M2 running Sequoia 15.1

Attachments:

1. LinkSys-port-Map-NoMach-2.pdf

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