Why Windows 7 does not use the secondary DNS server?

Encountered a strange thing.
There are two DC in the domain, both, as usual, by the DNS server. Users in the properties of the network, respectively, two DNS servers, primary and secondary.
But when it falls off the main PC with Windows 7 continues to apply to it and therefore can't resolve the names. Second normal nslookup manually.
Question: bug or feature? MB curve hands of administrators, who all set up?
UPD. Debian coped with the switch to the secondary, by the way, Windows 7 does not. About the responses from the primary DNS server (no network interface) - like they were not.
July 8th 19 at 11:46
3 answers
July 8th 19 at 11:48
Solution
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Only when the DNS client gets to (2), will be interviewed other servers.
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The trouble is that, as far as I remember (but time to understand was not particularly, ran into the backend to look at the area), responses from the primary server was not - neither negative nor positive. - moises commented on July 8th 19 at 11:51
July 8th 19 at 11:50
Solution
If the client receives the first DNS answer NXDOMAIN (Non-existent Domain Name), that's still considered the answer and the reason for switching to the second DNS no.

Windows will switch to the second DNS in that case, if it does not receive a response from the DNS server, i.e. the DNS server itself will no longer be available.
And if the primary DNS server from working, only the network interface, i.e. it can ping, but DNS requests are not responding, the secondary will still not be used? - moises commented on July 8th 19 at 11:53
: If the DNS query does not respond, then the DNS should switch.
If not, you can check the block diagram from , there may be options, such as call record is already in the local cache of NXDOMAIN and not as perestrahovatsya to ipconfig /flushdns or the expiration of the TTL period the local cache. - moises commented on July 8th 19 at 11:56
July 8th 19 at 11:52
It seems that you have either a virus or some Tulsa interferes with the DNS change.
If you do not confuse the change of server occurs if more than 30% of packages were returned with an error (or not returned).
KES is used, nothing else. - moises commented on July 8th 19 at 11:55

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