malformed DNS query

[Yves Dorfsman]

On CoreOS, runnng openssh sshd version "OpenSSH_6.6p1-hpn14v4, OpenSSL 
1.0.1g", when connecting the following query is sent to the DNS server:

     query[A] 2.2.0.10.in-addr.arpa

Which makes no sense, it's an "A" request for a reverse record.
Adding "UseDNS no", prevent the request (proving that the request does come 
from sshd).

When connecting to machines with older sshd (OpenSSH_6.6.1p1, OpenSSL 1.0.1f) 
the request is a PRT request as expected.

Any idea why this is happening? Is this a change in sshd or some other 
configuration on the server?


-- 
Yves.