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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