DNSE-740 — Proxy received reply with unexpected response code
The proxy has received an unknown (E-level) or unexpected (W-level) response code from a server.
In the former case, the whole answer is ignored and next server is tried, in the latter case, the reponse is resent to the client.
If the server name has form #n.resolver-section-name.APR, then this message reports a failure of Asynchro Paralel Resolver of particular proxy.