this is RedHat and a OLD version 6.4 ( 6.6 is the current in the 6 series )
so you DO have the
required support contract that you bought and are NOW paying even more for to lock it at a OLD version
https://www.redhat.com/wapps/store/catalog.html
you are paying RedHat a LOT of cash every year for the 6.4 backports
so
have you asked redhat ?
you ARE paying for the required tech support
You might want to use it
That support contract also gets you access to the Redhat KnowledgeBase
https://access.redhat.com/search/bro...#?&language=en
you wil lhave to login using the account you set up with the license