UPDATE ......From Tuesday 8 April 2025 we have changed the way that Single Sign-on works on this wiki. Please see here for more information:
Update
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But again, SURFnet comes to the rescue, because several of their NTP servers are IPv6-enabled. I picked chime3.surfnet.nl, which, according to the web interface, appears to be a Meinberg NTP server. Windows seems to dig it:
