Thank you for the suggestion. The link you provided appears to be for vCenter 5.1, not 5.5. However I have already gone through the steps to add AD as a SSO source for vCenter 5.5. Everything regarding ADDING the source works correctly. Its when I go to browse for resources in AD, via that source once it is added, so that I can add admins to SSO or add users to roles in vCenter is when I have a problem. The browse windows and search functionality returns no data.
