Ubuntu: Port seems to be closed although Service is listening



Question:

I have a Server running Ubuntu Server 16.04.1 LTS and Minecraft on my local network. My problem is that I cannot connect to the server from my local network.

The Server and Minecraft are both started and the MC Server is configured to use the port 25565.

As a router I have a Zywall USG 50.

While the command netstat -an | grep "LISTEN " shows that the server is listening on port 25565: Netstat.

a nmap scan performed from the server shows that the port is not open: nmap scan.

I have also checked the firewall configuration and it is set to allow the specified port.

I am at a loss here and would greatly appreciate any help I can get.


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