The auxiliary port is a feature that permits clients to connect to usual ports (normaly 80/http, 443/https) in servers that have said feature on, and and so bypassing very restrictive firewall/proxy rules.
Only clients with said patch are allowed, because they dont send such ports to other clients when comunicating (at least that is one of the rules, there may be more, didnt saw the patch).
Why it affects the search is a mistery for me ?(