Fibre NH20A port forwarding issues: works for some ports, not for others

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I'm trying to port-forward for a valheim server. Ports 2456-2458

• computer acting as server has a DHCP reservation
• server is setup as DMZ
• firewall is down
• setup up with a dynamic dns

The interesting part:

• ssh port-forwarding works at the IP address assigned and the dynamic dns domain (port forwarding for 22 works)
• I can connect to the server on the local network by entering the local ip address (the server is up and accessible, if only locally)
• when I try to connect to the ip address or ddns domain in-game, I can't connect
• when I try to check if the port is open, common tools say that it's not open
• UPNP is off

The configuration is the same between ssh and valheim, so I'm scratching my head as to why it's not redirecting appropriately. Any tips?


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