Steffen it sounds like you may need to open an incoming port on your linux firewall (assuming it's enabled).
Open a terminal and input:
Is the firewall active? (If not then this isn't the problem)
If the firewall is active then:
Repeating the first command:
..should show that:
Open a terminal and input:
Code:
sudo ufw status
If the firewall is active then:
Code:
sudo ufw allow in 8333
Code:
sudo ufw status
Code:
Status: active
To Action From
-- ------ ----
8333 ALLOW IN Anywhere
8333 (v6) ALLOW IN Anywhere (v6)
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