Why does "ypcat shadow.byname" return error for non root users?

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Issue

Why does "ypcat shadow.byname" return error for non root users?

$ ypcat shadow.byname
No such map shadow.byname. Reason: Internal NIS error

Environment

Red Hat Enterprise Linux 4
Red Hat Enterprise Linux 5
Red Hat Enterprise Linux 6
How do I enable password aging with NIS?

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