The root update package KB931125, when applied might break the authentication process on servers using certificate based authentication: This problem was reported for LDAP over SSL authentication on a Domain Controller, IIS authentication on a webserver and IAS authentication on a Radius server (called Network Policy Server under Windows 2008). The symptoms, patch and workarounds of this issue are explained in this KB. The patch is only available under Windows 2003 and the root update package (KB931125) cannot be uninstalled via WSUS once applied.
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This script compares the updates approved between two WSUS target groups. It can ben useful when you want to get the differences between a test and a production group, you can read this Group Policy Central article to get more details on how to set up a WSUS test group using GPO (chapter Implement a WSUS Update Test Group of Computers).
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In this post we will describe how to make a WSUS clients inventory, we will search for the computers in your domain which are not able to receive MS security updates because they are not supported any more or because there is a misconfinguration on the WSUS client. Below is a tab listing supported OS and Service Packs versions:

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