I just uploaded the new NTP Installer for Windows on our NTP Download page. Besides replacing the previous ntp version with the current stable ntp 4.2.4p4 release I fixed a number of bugs which have been annoying users for quite a while now. Especially the unattended mode (UAM) has been fixed and has been tested extensively on several different machines in different environments.
While the performance on XP seems to be good, Windows Vista is a different story. In our tests on the 32bit and 64bit versions of Microsoft's draft OS showed that they behave differently when running exactly the same ntpd version.
Nailing the polling interval at 16s seems to at least help a bit, but this is of course only possible when you either operate your upstream NTP server yourself or have the permission of the server's operator to crank up the request rate with "minpoll4 maxpoll 4".
However, this would only be a temporary workaround and further tests indicate that the basic problem is still there and using the 16 seconds interval simply reduces the effect of it up to a certain degree.
I am happy to receive feedback and comments regarding the NTP Installer, so please feel free to contact me via mail (ntp-support@meinberg.de) or use the "comment" feature of this blog.
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