Hmmm your firewall needs the port opened to listen on LAN or on the Web but it shouldn't block 127.0.0.1:8333
Try:
$ sudo apt-get install ufw
$ sudo ufw allow 8333
$ sudo ufw enable
Hmmm your firewall needs the port opened to listen on LAN or on the Web but it shouldn't block 127.0.0.1:8333
Try:
$ sudo apt-get install ufw
$ sudo ufw allow 8333
$ sudo ufw enable