block unsafe query setting cause DNS query to local intranet DNS zone 3 seconds delay on response
from 2021/05/05 we can see that our servers with Server Security Premium 14.10 have delay of approx 3 seconds (2,8) for DNS query / response for A record in local intranet zone (local DNS server is authoritative for that zone). It happens on servers which do not have internet connection.
This delay in response cause delay in processing data because connection to needed remote host is also delayed and all tasks are slower and need more time to finish.
What was changed in definitions update on 2021/05/05 that can cause this issue ?
Why to block or slow down query for local intranet DNS zone ?
Why we do not see this issue on servers which have outgoing internet connection ?
What should be now recommended setting ? Of course, now I will implement check on every server for DNS query delay just to be on the safe side for future similiar or same issues.
I know that there is new Server Security Premium 15.01 and we will make upgrade but this issue cause a lot of trouble because of delay untill we've found root cause.
Thank you for any advice.