On Fri, 12 Oct 2018 11:43:09 -0700 (PDT), wrote:

By the way, you didn't mention the results of the test to check for NAT.
I'm guessing you'll find that NAT is indeed involved.

I am not sure what test you mean ?

From my first post to this thread:

In any web browser, navigate to https://www.whatismyip.com/
(There are lots of similar sites, but I suggested that one because it
displays *both* addresses - local and public.)
Your local IP address will be displayed, along with your 'Public' IP
address. If the two addresses are the same, there's no NAT. If the two
addresses are different, there is a strong likelihood of NAT, although
not necessarily.

I did test udp/ip a moment ago... and it was working the way I expected it to work.

I find the test you mentioned, this shields up to vague, it does not specify which ports are being tested, it scans a bunch I don't need/want that.

I need only one udp port to be scanned/tested, this is enough for me.

So I used a different scanner/udp generator mentioned somewhere else in this thread.

Shields Up can be used to probe a specific port. Just click the button
called "User-Specified Custom Port Probe". Enter the desired port and
away you go.

This keeps down complexity and avoid any problems like bandwidth shortage or spam protection etc.

So I like the more "simple" test better than a full range test.

For now I do not believe my PC is "natted" at least not for IP/UDP.

It sounds like you haven't checked for NAT just yet, so it's too early
to say. Go ahead and test as I described above, using
https://www.whatismyip.com.

TCP/IP may be a different matter.

I also still does not explain why coin system 1 seems to work and coin system 2 does not seem to work.

Only testing can figure this out.

coin system 2 which is a clone of 1 used a different dns name to find my computer... according to others this dns is working just fine and I can confirm it's working just fine.

One more test I could do is replace the dns name (I don't like DNS in general for networking but ok) with just hard-coded IP addresses see if that makes any difference.

I'm not sure what you're referring to, but it sounds like a new issue,
unrelated to the current discussion, right?