Check whether the name server on Host is responding.
+Host
Atom or string.
Description
With mps_ping the name server can be pinged, i.e. it succeeds if the
name server is up and running. Normally, it is not used in an
application, but it may be useful for debugging purposes. Be patient
when the mps_ping predicate seems to hang, because it can take a while
before mps_ping decides to fail.