Dear Texiwill,
Request you to shed more light on following statement as I m not able to understand the same.
"Local to the machine users can always login to vCenter if you have given them permission, so if SSO goes away, you can still access vCenter."
u mean to say that provide permission to vcenter local user on VC, if sso fails we will be able to login with vcenter local user, correct me if I m wrong.
Note: VC and SSO installed on different VMs
regards
Mr VMware