sudo iptables -A OUTPUT -d 1.2.3.4 -j DROP where 1.2.3.4 is the ip address you want to block outgoing connections tosudo iptables -D OUTPUT -d 1.2.3.4 -j DROP to allow it again


sudo iptables -A OUTPUT -d 1.2.3.4 -j DROP1.2.3.4sudo iptables -D OUTPUT -d 1.2.3.4 -j DROP