I am trying to access my Arduino Yun from the internet, and it's not quite working. I have correctly port forwarded the port 5555 from the router to the Yun (verified I am able to access my many other NAT'd resources).

I can access the Yun from my internal network.

In the Arduino sketch I have this (among many other things). Mainly taken from example sketches.

#include <Bridge.h>
#include <HttpClient.h>
#include <YunServer.h>
#include <YunClient.h>

YunServer server;

void setup {
   // Listen for incoming connections on port 5555

Is server.noListenOnLocalhost(); the right one to use to access from the outside world?


1 Answer 1


Well, I'm not familiar with the Yun, but the first thing that stands out is the missing


line apparently needed to initialize the Bridge library that you use.

And you do have something like

YunClient client = server.accept();

and "more" in the main loop (or a function where applicable) of your code, right ?

And yes, noListenOnLocalhost() is the correct function for serving external clients.

  • Yes, I have Bridge.begin(); and YunClient client = server.accept(); is there within the loop. I'm able to access everything internally, just not externally.
    – Pat
    Feb 26, 2014 at 17:46
  • So your answer helped me validate that what I am doing is correct. I'll mark it as solved. What ended up happening is that my router didn't save the NAT for port 5555. So I re-did that, and it's good. Thanks again for verifying that noListenOnLocalhost() is correct for external hits!
    – Pat
    Feb 26, 2014 at 17:50
  • @Pat Glad to have... ahem... "helped" :-)
    – FredP
    Feb 26, 2014 at 17:53
  • You did! I wasn't sure if noListenOnLocalhost() was correct, and the documentation on noListenOnLocalhost vs listenOnLocalhost wasn't overly clear (I think they both say the exact same thing).
    – Pat
    Feb 26, 2014 at 17:54
  • The doc is "correct", but indeed not very explicit regarding internal VS external. And I must admit that when I first saw the function name I found it rather suspect.
    – FredP
    Feb 26, 2014 at 17:58

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