http://blogs.technet.com/b/instan/archive/2009/09/02/why-living-in-the-future-is-bad-when-you-re-a-ca-server.aspxI worked on the following case recently: We can't seem to enroll for certificates from our Windows 2008 OCS Servers, the error we get is "A required certificate is not within its validity period when verifying against the current system clock or theen-USTelligent Evolution Platform Developer Build (Build: 5.6.50428.7875)http://blogs.technet.com/b/instan/archive/2009/09/02/why-living-in-the-future-is-bad-when-you-re-a-ca-server.aspx#3339134Fri, 18 Jun 2010 21:54:57 GMTd5e57398-b9ef-4490-9955-07cbb4e4a80d:3339134Ingolfur Arnar Stangeland<p>Can you be more specific concerning &#39;post-dated&#39; - is the certificate you&#39;re trying to import expired or with a &#39;not valid before&#39; date in the future?</p> <div style="clear:both;"></div><img src="http://blogs.technet.com/aggbug.aspx?PostID=3339134" width="1" height="1">http://blogs.technet.com/b/instan/archive/2009/09/02/why-living-in-the-future-is-bad-when-you-re-a-ca-server.aspx#3339088Fri, 18 Jun 2010 16:23:46 GMTd5e57398-b9ef-4490-9955-07cbb4e4a80d:3339088Stephen<p>Anyone aware of any way to change the certificate import behavior? &nbsp;I&#39;m running into a similar issue with post-dated user certificates in Win7, which has never been a problem with any other environment, but this inability to install a not-yet-valid certificate is going to cause us some problems if we can&#39;t resolve it.</p> <p>Thanks for any insights.</p> <div style="clear:both;"></div><img src="http://blogs.technet.com/aggbug.aspx?PostID=3339088" width="1" height="1">