// The AXFR probably failed due to a problem on the master server. If SOA-checks against this master
// still succeed, we would constantly try to AXFR the zone. To avoid this, we add the zone to the list of
// failed slave-checks. This will suspend slave-checks (and subsequent AXFR) for this zone for some time.
// The AXFR probably failed due to a problem on the master server. If SOA-checks against this master
// still succeed, we would constantly try to AXFR the zone. To avoid this, we add the zone to the list of
// failed slave-checks. This will suspend slave-checks (and subsequent AXFR) for this zone for some time.