ESXi servers not showing up in vCenter

I have two ESXi(5.5) hosts, each with 2-4 virtual guests installed and up and running on them.  I just installed vCenter and vSphere WebClient on a separate physical server with no issues, however when I login to the vSphere WebClient, either as a local server admin or a domain admin, all inventory(hosts, datacenters, datastores, etc...) show up empty.  There is NOTHING.  Do I have to somehow register the ESXi servers with the new vCenter server, or am I missing something else...?  Thanks in advance.
tenoverAsked:
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Pete LongTechnical ConsultantCommented:
Yes you need to add the ESXi hosts to the cluster?

Right click cluster > add host > follow the instructions.
Pete LongTechnical ConsultantCommented:
see here

PL
Andrew Hancock (VMware vExpert / EE Fellow)VMware and Virtualization ConsultantCommented:
You need to add the hosts to vCenter Server.
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tenoverAuthor Commented:
I can't even right click, it does nothing.

EDIT:  Thanks for that link.  I was logging directly into the vSphere WebClient, not the "old" vSphere Client.  Installing that now and will try again.
Andrew Hancock (VMware vExpert / EE Fellow)VMware and Virtualization ConsultantCommented:
use the vSphere Client connect to vCenter Server, are the hosts present?
Pete LongTechnical ConsultantCommented:
Are you making progress now?
tenoverAuthor Commented:
Well, I can't even login to the vCenter server IP address using the normal vSphere Client, it says I don't have permissions, even though I've tried logging in as the local server Administrator and a domain admin.....I CAN login to the WebClient using both of these same credentials.
Andrew Hancock (VMware vExpert / EE Fellow)VMware and Virtualization ConsultantCommented:
have you defined the correct permissions?

have you logged in as vsphere.local ?
Pete LongTechnical ConsultantCommented:
if you have installed vCenter ona windows server use your Windows credentials.
If you have used the Virtual Center appliance then the username will be root.
tenoverAuthor Commented:
I've logged into both ESXi servers plenty of times as root.  I've installed and logged into the vSphere WebClient as a domain admin and local Administrator.  I have not logged in as "vsphere.local".  Do you mean I should login to the vSphere client as "vsphere.local\Administrator" ?  Sorry, very new to vCenter.  Appreciate the help.
Andrew Hancock (VMware vExpert / EE Fellow)VMware and Virtualization ConsultantCommented:
You need to define correct permissions using SSO in vCenter 5.5.
Andrew Hancock (VMware vExpert / EE Fellow)VMware and Virtualization ConsultantCommented:
thats correct. does that user login correctly?
tenoverAuthor Commented:
Ahhhh.....thank you!  I was able to login to the vSphere client using the vsphere.local\Administrator account and add the hosts, then login to the vSphere WebClient with those same credentials and everything showed up as expected.  How can I make it so that a domain admin can login and have full access to the vCenter vSphere information?
Andrew Hancock (VMware vExpert / EE Fellow)VMware and Virtualization ConsultantCommented:
You need to add your domain as an authentication source.

I would have look through fellow vExpert Derek Seaman's Guide on vCenter 5.5 setup and SSO.

http://www.derekseaman.com/2013/10/vsphere-5-5-install-pt-1-introduction.html

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