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Kerberos authentication through load balancer

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http://serverfault.com – I generally understand the problems that a load balancer poses for Kerberos. In fact, Microsoft's KB article outright states that it's not possible. However, this article - also on an MS site - suggests that there are possible workarounds. Has anyone configured a system to use Kerberos and a load balancer? Did you need to use a Forefront server? Can you describe your setup? Also, what is the precise functionality that the Forefront server provides that makes this work? As I understand it, each server behind the load balancer requires a different SPN and anything in front of the load bal (HowTos)