vCenter 5.0 to 5.1 Upgrade Issue

Hi people.

I upgraded vCenter from 5.0 to 5.1 and now I can't login using Active Directory accounts.

When I try login in Web Client, I get the follow error:

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When I try login in vSphere Client, I get the follow error:

Image may be NSFW.
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I can login using the vmware service account and using admin@system-domain account.

I'm using Windows 2008 R2.

Any help will be appreciated.

Thanks