Hi list,
I run a validating recursive resolver with BIND 9.18.27. Over the
course of many days, I have noted the following warning about a missing
cookie from a particular server:
09-May-2024 20:09:22.277 resolver: info: missing expected cookie
from 192.5.5.241#53
This server runs in the cloud with excellent connectivity, I don't do
anything special with my firewall and I do not run any software that
would mutate the DNS data over port 53.
What could be causing the cookie to not be received from this particular
server over a number of days ?
Thanks,
- J
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