Connectivity Problem with Seven Days To Die - Only ports 2226, 26902, and 26913 are open

System Information

Field Value
Operating System Linux - Debian GNU/Linux 12 on x86_64
Product AMP ‘Phobos’ v2.6.2.6 (Mainline)
Virtualization Docker
Application Seven Days To Die
Module GenericModule
Running in Container Yes
Current State Ready

Problem Description

Issue

For some reason I can’t get the Server and Steam Ports to listen. Reinstalled 7 Days to Die to the newest stable version.

Reproduction Steps

  • Changed the ports 26900-26903 to something different, but it’s the same exact ports that will listen.
  • Rebooted the entire system. Triple checked my firewall rules and NAT settings. I have another game that runs fine just not this one.
  • Checked Debian to make sure the ports were not being used by another application. They’re not.
  • Went over all the 7 Days to Die settings and they seem to be correct. I’ve had this game running before, but after a couple of updates it just stopped.
  • I also updated AMP to the newest version.
  • Ran nmap on another PC using a different ISP to check 7 Days to Die ports and it shows that 26900/udp, 26901/udp, 26903/udp, and 26900/tcp are closed, but 26902 is open and filtered so it isn’t a firewall issue.