IIS can be configured for Classic Pipeline by going to the Internet Information Services (IIS) Manager and finding the Secret Server application.
The Secret Server application needs to be configured to use an Application Pool that is using the Classic Pipeline mode.
If you do not have an Application Pool using Classic Pipeline, then you will need to create a new Application Pool that is using Classic Pipeline and assign the Secret Server to use the new application pool.
For more information about Application Pools and the Pipeline configuration, please consult the installation guide for Windows Vista / Windows Server 2008 at
http://updates.thycotic.net/link.ashx?Windows6InstallerGuideArticle ID: 37, Created On: 1/28/2009, Modified: 3/26/2009