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Massive NTP v4 requests from IoT devices

Hi folks,

I'm not very familiar with NTP, and the RFC didn't answered my questions so far. Hope that someone can help me.

We're having some Siemens IoT devices in our network for different purposes. All of them are sending a lot of NTP requests to our NTP appliance. The ammount of requests is equal for all devices (about 8.000 per hour).

The reference timestamp in the client packets is always 00:00:00, 01 Jan. 1970. Therefore I guess that the devices don't understand the NTP reply from our NTP appliance.

Could you give me a hint what's going on here?


Thank you. Jas Man