Having trouble keeping the time in Windows right? The long-time-default time sync machines time.windows.com and the one at nist ( time.nist.gov ) no longer work. Somebody tipped me of tick.usno.navy.mil (192.5.41.40) and US DC tock.usno.navy.mil (192.5.41.41) . You should check whether your Internet Service Provider offers a timeserver (mostly named ntp.ispname.countrycode-or-com). Another solution is the NTP-pool.