From output it is clear that firewall is block access to 20000, to open firewall, type
First save firewall, so that you can restore the same
Code:
sudo iptables-save > current.firewall.rules
To stop firewall you need to type all following commands:
Code:
sudo iptables -X
sudo iptables -t nat -F
sudo iptables -t nat -X
sudo iptables -t mangle -F
sudo iptables -t mangle -X
sudo iptables -P INPUT ACCEPT
sudo iptables -P FORWARD ACCEPT
sudo iptables -P OUTPUT ACCEPT
Now you should able to connect. I recommend opeing up tcp port 20000 and reloading firewall again.