The authentication server returned an unexpected error: ns0:RequestFailed: Internal Error while creating SAML 2.0 Token. The error may be caused by a malfunctioning identity source.
Ideas? Cant login with vsphere client or web client? Not even on the local vCenter Server itself?
Please check whether http://kb.vmware.com/kb/2034798 helps solving your issue.
André
Do you have Active Directory services down for any one of the Active Directory domains configured in Single Sign-On? If yes, this KB may be of help solving your issue http://kb.vmware.com/kb/2048177