IP table update

sudo iptables --flush
sudo iptables --delete-chain

allow loopback

sudo iptables -A INPUT -i lo -j ACCEPT
sudo iptables -A OUTPUT -o lo -j ACCEPT

allow established connections

sudo iptables -A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT

allow 80 and 443

sudo iptables -A INPUT -m state --state NEW -m tcp -p tcp --dport 80 -j ACCEPT
sudo iptables -A INPUT -m state --state NEW -m tcp -p tcp --dport 443 -j ACCEPT
sudo iptables -A INPUT -m state --state NEW -m tcp -p tcp --dport 22 -j ACCEPT

default policies
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sudo iptables -P INPUT DROP
sudo iptables -P OUTPUT ACCEPT

In case to allow access from pc only to 80 and 443 do Delete curent rules and chains

sudo iptables --flush
sudo iptables --delete-chain

allow loopback

sudo iptables -A INPUT -i lo -j ACCEPT
sudo iptables -A OUTPUT -o lo -j ACCEPT

allow established connections

sudo iptables -A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT

allow traffic to 80 and 443

sudo iptables -A OUTPUT -p tcp --dport 80 -m state --state NEW,ESTABLISHED -j ACCEPT
sudo iptables -A OUTPUT -p tcp --dport 443 -m state --state NEW,ESTABLISHED -j