DNSE-790 — Proxy tried all possible servers getting no answer
Proxy tried at least one (unsuccessfull) attempt to ask a server for the domain. However, there is no better server than the last queried one.
Check the previous log messages to find the reason of previous query attemps failures.
If the zone name has form resolver-section-name.APR, then this message reports a failure of Asynchro Paralel Resolver of particular proxy.
Request is replied with ServFail response code.