Symptoms:
VMware vCenter Server 4.1.x
VMware vCenter Server 5.1.x
VMware vCenter Server 5.0.x
If the vSphere Client is connected to a vCenter Server system that is part of a connected group in vCenter Linked Mode, you can search the inventories of all vCenter Server systems in that group. You can view and search only for inventory objects that you have permission to view. Because the search service queries Active Directory for information about user permissions, you must be logged in to a domain account to search all vCenter Server systems in linked mode. If you log in using a local account, searches return results only for the local vCenter Server system, even if it is joined to other servers in linked mode.
To resolve this issue, ensure you log in as a domain account with rights to all vCenter Servers and has enough privileges to add/modify permissions:
If you do not have a Domain user, create one with Add/Modify privileges:
To ensure that the Inventory Service is running with a Domain Account, by default it is local: