http://blogs.technet.com/b/sus/archive/2009/02/19/troubleshooting-guide-for-issues-where-wsus-clients-are-not-reporting-in.aspxThis guide is written to assist specifically in troubleshooting WSUS when clients are not reporting in. We will examine common troubleshooting considerations that needs to be looked at on the WSUS server only , not on the WSUS client. GPO considerationsen-USTelligent Evolution Platform Developer Build (Build: 5.6.50428.7875)http://blogs.technet.com/b/sus/archive/2009/02/19/troubleshooting-guide-for-issues-where-wsus-clients-are-not-reporting-in.aspx#3427140Fri, 06 May 2011 07:17:14 GMTd5e57398-b9ef-4490-9955-07cbb4e4a80d:3427140Laurynas<p>In my case it was a problem with Local Security Policy setting &quot;Deny log on to this workstation from network&quot;, that had &quot;Guests, ANONYMOUS LOGON&quot; configured. Well, for WSUS servers it is better to remove ANONYMOUS LOGON ;&gt;</p> <div style="clear:both;"></div><img src="http://blogs.technet.com/aggbug.aspx?PostID=3427140" width="1" height="1">http://blogs.technet.com/b/sus/archive/2009/02/19/troubleshooting-guide-for-issues-where-wsus-clients-are-not-reporting-in.aspx#3228211Mon, 20 Apr 2009 17:59:57 GMTd5e57398-b9ef-4490-9955-07cbb4e4a80d:3228211msartoris<p>Hello everybody, </p> <p>I followed your instructions, but there are a still number of workstations, including mine, that do not report in (more or less 250 out of 550). We are running WSUS 3.0 SP1 on Windows 2003 SP2. Clients run XP SP2. In the log there are no 401.2 or 404 errors. My PC does download the updates, but it does not appear in the list of computers on the WSUS server</p> <div style="clear:both;"></div><img src="http://blogs.technet.com/aggbug.aspx?PostID=3228211" width="1" height="1">