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NTP is sometimes blocked

I have an UTM Hot-Standby Cluster on a performant ESXi Server.

I'm getting about 2-5 NTP requests per second because I'm part of the ntp.org community.
There's a NAT roule From Any -> NTP -> External Address --> Internal Address -> NTP so the NTP Packets are being logged in the Firewall log.
The NTP Services is allowed from any(IPv4/IPv6), I also added a Rule for Any -> NTP -> Any, but i think this should not be necessary for external requests.

But sometimes (1-5 times a minutes) i see blocked NTP packages to my Internal address?! Why? Is the NTP Services of the UTM not fast enough?

btw: 10.19.1.1 is my Internal Address

Michael


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