http://blogs.technet.com/sus/archive/2008/08/14/wsus-clients-fail-to-update-with-error-code-0x80190194.aspxHere's a great tip from Rob Coffey, a real life WSUS support engineer from North Carolina. We've seen reports of this occurring if you upgrade to WSUS Service Pack 1 and then remove the SP although I haven't been able to confirm this myself. If you haveen-USCommunityServer 2.1 SP1 (Build: 61025.2)http://blogs.technet.com/sus/archive/2008/08/14/wsus-clients-fail-to-update-with-error-code-0x80190194.aspx#3116185Wed, 03 Sep 2008 05:46:50 GMTd5e57398-b9ef-4490-9955-07cbb4e4a80d:3116185 WSUS???0&#215;80190194??????<p>PingBack from <a rel="nofollow" target="_new" href="http://baalchina.nau.edu.cn/2008/09/wsus-0x80190194/">http://baalchina.nau.edu.cn/2008/09/wsus-0x80190194/</a></p>