Hello,
As you might have noticed the error basically indicates that the DNS Server
received
an invalid DNS packet from a specific server and as it is invalid it is
being ignored.
The reason it is getting logged at those specific timings could be that
someone
on your network is probably trying to access those domain names at that
particular time.

Signature
Thanks,
Mohanchand Koduri [MSFT]
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> I am getting several errors in the event log of our PDC for event 5504
>
[quoted text clipped - 3 lines]
> any ideas?
> thanks