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The port is running already it can be check through netstat -a.
But openning in browser refuses the connection. 
This is due to firewall blocking the port, It needs to be allowed.
Check all port allowed by firewall: 
sudo ufw status
Allow a port
sudo ufw allow 8890


https://askubuntu.com/questions/166068/port-seems-to-be-open-but-connection-refused