How can I actually open port 123 on my CentOS server, so I can synchronise my server with another server's time?
I couldn't be able to open 123 port using google guides.
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What makes you think it's closed? – EEAA May 18 '13 at 14:23
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It is closed because I always got the message, that Operation is not permitted, wehn I want to update it with NTP – Quentin McLoad May 18 '13 at 14:38
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Sounds like you're not `root` – Ben Lessani May 18 '13 at 14:44
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But I am the root. I can access everything. I have accessed it via SSH and with the root pass. – Quentin McLoad May 18 '13 at 14:45
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the answer is: you can't run ntpdate if ntpd is running. Either check if ntpd is synchronized running ntpq -p , or stop ntpd - service stop ntp - and run ntpdate – Olivier S May 18 '13 at 17:52
1 Answers
2
In iptables
To open OUTBOUND
iptables -A OUTPUT -p udp --dport 123 -j ACCEPT
To open INBOUND
iptables -A INPUT -p udp --dport 123 -j ACCEPT
Ben Lessani
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Where should I insert this? Also in which format should I enter these information? – Quentin McLoad May 18 '13 at 14:37