Ntp
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Network Time Protocol, synchronize local clock to remote.
To user ntpq the firewall should be open for traffic to the localhost.
iptables -A INPUT -p all -j ACCEPT -s 127.0.0.1 -d 127.0.0.1
iptables -A OUTPUT -p all -j ACCEPT -s 127.0.0.1 -d 127.0.0.1
ip6tables -A INPUT -p all -j ACCEPT -s ::1 -d ::1
ip6tables -A OUTPUT -p all -j ACCEPT -s ::1 -d ::1