In Ax 2012 EP "You cannot view data on this page because you are not a registered user in Microsoft Dynamics AX.Contact your Microsoft Dynamics AX administrator."

In Ax 2012 EP 

"You cannot view data on this page because you are not a registered user in Microsoft Dynamics AX.Contact your Microsoft Dynamics AX administrator."

My resolution:
- Import .net bc in all partition in dynamics ax with system user permission
- Set .net bc in all partition in dynamics ax in system service account
- Go to "System administration \ Set up \ Enterprise portal \ Web site". Check the site url is correct: http:///sites/DynamicsAx.