To make everyone happy here is as little more detailed reason of what was going on:

The server its self has several gateways and public ips, the windows servers hosting factorio of which there was 2 server which are bound to two ports on the local ip of the windows server so:

0.0.0.0:40000 ...

Issue has now been resolved, thanks to @justarandomgeek> 'justarandomgeek' via IRC, issue was it is not possible to use different external ports and hostname than what your internal servers believe they are bound to.

*bump* can someone at least tell me what ips need to be allowed to connect to and from?

*bump*

I seem to have added this rule for that server:

pass in quick on $bhyve_dev proto tcp from $kenny to { 23.21.158.102/32, 54.225.116.249/32, 54.243.136.138/32 }

I presume that is so that website can download that file in the log

Yeah nat punching is not going to work in this case, there is no NAT in use only bridge filtering, would this be it I cannot see it raising an error:

0.002 2017-10-23 10:00:59; Factorio 0.15.37 (build 30927, win64, alpha)
0.003 Operating system: Windows 8.1
0.004 Program arguments: "factorio ...

Fixed, thanks.

And no, we're not migrating the 3rd biggest channel on esper :D

Hey there I notice your staff any chance you can take a quick peek at my other question/post, I cannot spot the answer in any of the FAQ's and no one seems to know (presumed with the lack of replies): https://forums ...

Bump, I did not realize it was such a difficult question

Where can I find more information?
A: 1. Use the wiki: https://wiki.factorio.com
Have a look especially for the news-section and look into Application directory!
2. There is an IRC channel: #factorio @ irc.jesper.net


[23:11:46] * Looking up irc.jesper.net
[23:11:46] * Connecting to irc.jesper ...

Hey all I am having a bit of trouble setting up a public multiplayer server (non modded)

I have unblocked inbound PORT 34197 to the server, and me and friends can connect to it no problem, the issue is this server is heavily firewalled. it has access to a nameserver and that port ONLY.

all ...