I've been struggling with this issue on 5.5 for quite some time, see also:
VMware vSphere Server Appliance 5.5 SSO doesn’t like lack of proper DNS in a home lab, here’s a workaround
TinkerTry.com/vmware-vsphere-server-appliance-workaround
Finally figured out a workaround that addresses this problem earlier this week, published yesterday (with step-by-step video walk-through):
vCenter Server Appliance 5.5 in a home lab, without SSO errors
TinkerTry.com/vcenter-server-appliance-5-5-in-a-home-lab-without-sso-errors
I've been enjoying repeated success in my lab/test environment. Yes, I have no reverse DNS/PTR records (typical limitation of consumer routers). This is not best practices for production. This is merely a workaround, suitable for the home or lab. No support implied by VMware or myself, this is just an FYI.
TinkerTry.com