I server NTP del NIST sono almeno in parte KO e fuori sync rispetto al tempo di riferimento:
In short, the atomic ensemble time scale at our Boulder campus has failed due to a prolonged utility power outage. One impact is that the Boulder Internet Time Services no longer have an accurate time reference. At time of writing the Boulder servers are still available due a standby power generator, but I will attempt to disable them to avoid disseminating incorrect time.
The affected servers are: time-a-b.nist.gov time-b-b.nist.gov time-c-b.nist.gov time-d-b.nist.gov time-e-b.nist.gov ntp-b.nist.gov (authenticated NTP)
Il NIST su X però scrive che:
Don't worry: time isn't broken. NIST's backup systems kept providing accurate time even during the power outage in Boulder. Our clocks drifted about 4 microseconds or millionths of a second, which we will correct when power is fully restored.
Quindi non è chiarissimo quali e dove siano questi sistemi di backup. Nella comunicazione c'è anche scritto che:
Another campus building houses additional clocks backed up by a different power generator; if these survive it will allow us to re-align the primary time scale when site stability returns without making use of external clocks or reference signals.
Ma sono solo di backup come reference di disaster recovery o sono esposti pubblicamente?