Hi,
I went through the article and checked the server.cfg files and the UPnP is enabled. I’ve attached the files so you can have a look through and see if there are any errors/things that need changing. I’m not sure how to check whether UPnP is enabled on the router though.
Another thing I noticed when using NoMachine is that the gateway port on my mac works, but when I tick it and restart the server on the linux pc it comes up with the error: ‘Failed to map port to the gateway’.