Why does NTP require bi-directional firewall access to UDP port …
https://superuser.com/questions/762579/why-does-ntp-require-bi-directional-firewall-access-to-udp-port-123
WEBJun 2, 2014 · Why does NTP require bi-directional firewall access to UDP port 123? Ask Question. Asked 9 years, 10 months ago. Modified 4 years, 11 months ago. Viewed 72k times. 21. From What are the iptables rules to permit ntp?: iptables -A INPUT -p udp --dport 123 -j ACCEPT. iptables -A OUTPUT -p udp --sport 123 -j ACCEPT. Also, from …
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