Upgrading Domain Controllers from Windows Server 2003 to 2008

When looking to upgrade your Active Directory system and Domain Controllers from a Windows Server 2003 to 2008, you will need to go over the Checklist provided by Microsoft. One of the first steps in the checklist consist of preparing your environment to properly work with 2008. The following command

Some Client computers do not appear in the WSUS console

There are many reasons why some clients might not appear in the WSUS console. For example, GPO errors, a corrupt installation on the server or client side and issues with IIS  just to name a few. Many of these issues can be pinpointed by running the WSUS Client Diagnostic Tool