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Scheduled tasks run 1 second too early

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Dear Community,

I inherited a server-network from one of our sub-companies. There we have 2 Windows Server 2008 x64 Virtual machines, which are part of a Citrix Terminal Server Cluster.
The previous Admin set up Scheduled tasks to do several MS Access operations, as you can imagine, undocumented and no one can touch it.

We are working or shutting down the old 2008 servers and the whole Access world but this will take a few months. Intil then I wanted to monitor the tasks but they keep messing up my monitoring by running one second too early:
Screenshot of :59 timings

All these jobs were scheduled to run at :00 seconds, the full minute of their respective times, as you can imagine.

I have googled but found nothing similar so far, no one reports jobs that run exactly one second too early. Can anyone here help?

All servers sync to the same DC, all internal clocks run synchronous. The 2008 servers simply seem to "decice" on their own to start the jobs scheduled on themselves one second too early.

Why do they do that; why do they not simply wait until it is :00?


--------------------------------- ...ich bin der Jäger des Mondes, bis der Morgen erwacht!



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