Port 7777 Not Open?

Development Programming & Scripting Multiplayer & Networking
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Hello friends! I have been working on a prototype multiplayer game using unreal c++ and blueprint. I have tested two instances of the packaged game and on LAN it works as expected. One instance is the listen server and the other is just a client.

For simplicity the server is setup like this:

servertravel [mapnamehere]?listen

and the client connects by

open 127.0.0.1

All good! However, I am concerned. I am now trying to enable port forwarding on my router to see if this type of thing would work for two computers on different networks. I believe I have set up port forwarding correctly & there are no firewalls on my computer or my router. I have run my listen server as before, and once the game loads, I minimize and use a site such as “http://ismyportopen.com” (giving it my global ip and port 7777) and it says “Port is closed.” What a bummer!!!

So I started wondering Is this listen server even around locally? Maybe I succesfuly forwarded by port but there was nothing listening on my mac. So, on my mac I have tried to ping this port when my listen server was running, In terminal I typed:

$ telnet 127.0.0.1 7777

Trying 127.0.0.1…

telnet: connect to address 127.0.0.1: Connection refused

telnet: Unable to connect to remote host

Wow! Now I am confused. It should be using port 7777 and I CAN connect to it on LAN, so presumably that port should be listening right? I have also given a good look at the udp servers listed via

$ netstat -a -b

But I can not find any mention of 7777.
Can anyone help/give me advice? At this point I am struggling, I really want to show my friends the cool game I made for them :cry:

I should mention I’m using unreal 4.12.5, mac os x el capitan, and have

[OnlineSubsystem]

DefaultPlatformService=Null
In my DefaultEngine.ini as well as

DynamicallyLoadedModuleNames.Add(“OnlineSubsystemNull”);

In my Build.cs, as this is a mostly c++ project. I should also mention I’m super sad :‘’‘’( please help!!!

2

I figured out my issue. It had nothing to do with unreal. The port was being opened on my local comp, and it could be accessed by other computers within my network – it was just that I had 2 routers! So, I had setup port forwarding on the router my computer talks to, but I had not told the router that deals with the internet how what to do. In short I had to enable DMZ on my first router to let things through to the second! This explains why port forwarding has never worked for me!

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" In short I had to enable DMZ on my first router to let things through to the second"

no idea about DMZ. but what u said is that u did not have to touch 2nd router. by enabling DMZ in 1st router did the trick.
right?