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Discussion Starter #1
Good Afternoon Everyone,

I'm stumped and I need your help!.
I've been trying to host a dedicated server for Valheim – I've followed the linked instructions precisely. I have no issues in setting up and running the server from any of my local computers (I have 2 PC's, one that I use as a daily driver and a HTPC). To be clear I can connect to the server from any other computer on my Local Area Network. I also have no issues hosting a normal Valheim game (non-dedicated type).
My issue is that I cannot manage to host the server on the internet and get someone outside my LAN to connect (tried this using a laptop hot spotted to my phone) – because it seems my ports are not being opened or so it seems, the ports in question are 2456, 2457 and 2458 (needed to host a Valheim dedicated server).

MY SETUP

Router: DSL-AC68U running Asuswrt-Merlin firmware
NBN (NBN is Australia's national broadband network) Device: ARRIS CM8200
NBN Connection: HFC
NBN Provider: Aussie Broadband
The HFC coax cable runs to the ARRIS CM8200, from there an Ethernet cable runs from the ARRIS CM8200 to the DSL-AC68U, and from the DSL-AC68U I'm running Ethernet to both my PC's. I got the AC68U configured so that its LAN Port 4 is a WAN Port. Here are a few pictures of the setup.


ROUTER SETTINGS

For the sake of this thread the computer that hosts the server has the private IP 192.168.1.172. I use the following settings on my Router (DSL-AC68U).

Port Forwarding
I have forwarded ports 2456, 2457 and 2458 (TCP & UDP) aimed toward 192.168.1.172. Refer to the image below.

General Settings
Refer to the image below.

Firewall Settings
I have disabled the firewall on my router. Refer to the image below.

WINDOWS DIAGNOSTICS

To be clear I have allowed Valheim and Valheim Dedicated Server on my windows firewall.

I have my copy of ipconfig /all below.

I also have my netstat -a -n before and after hosting, in the 2nd image you can see the underlined server operating under port 2457.

Not Hosting
Not Hosting
During Hosting
imgur.com

ISSUE

As noted above I cannot connect to my Valheim dedicated server from the internet, in addition when I use websites like Open Port Check Tool -- Verify Port Forwarding on Your Router I get errors and it fails to see the open port. It is incredibly frustrating.
I would really appreciate someones help, I'm not network savvy at all.
 

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Team Manager - Networking , Moderator - Micros
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4,124 Posts
Open a command prompt and type: tracert 8.8.8.8 then press enter and post the results.
Have you tried temporarily turning your Windows firewall off and also putting your game server in the DMZ in your Asus router? That will bypass all the firewall restrictions and allow all traffic through as a test.
 

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Discussion Starter #3
Hi Fred, thanks for your reply, I found out the issue was my internet provider enabled CGNAT on my service so my public IP was actually a private IP. I asked them to remove CGNAT and now I can host my game server!
 

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Team Manager - Networking , Moderator - Micros
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4,124 Posts
Great, that's what I figured. The tracert command will show the extra hop if you're behind a dual NAT.
 
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