Whist Trying to add an ISA 2006 Server/Node to an Existing Enterprise Array, You may receive the following error during the final stages of setup.
"setup failed while initializing configuration agent"
Reason
This is due to a non standard ISAPI or Web filter installed within the array or a Corrupt Rule / Protocol within ADAM
Resolution
Temporally Remove the Non-Standard Filter via Add/remove programs. i.e Messagelabs Client Side Proxy, Websense Web Filter., Add the Node into the array, and re-Install Custom Filters
Further Debugging to Find Corrupt ADAM Object please refer to MS Blog.
http://blogs.technet.com/b/isablog/archive/2009/02/17/error-installing-a-replica-of-isa-server-2006-css.aspx - Ori Yosefi
