Before you upgrade to vSphere 5.5 some research, familiarizing and testing has to be done first. I hope you all skipped vSphere 5.1, it introduced a new Single Sign-On feature that contained bugs and clearly needed some more developing by VMware. Next came vSphere 5.5 were Single Sign-On was improved a lot. Upgrading or installing vSphere 5.5 is pretty straightforward. However I ran into two things that needed to be addressed after upgrading: