How to use the DenyUsers option in ssh to limit the user?

Solution Verified - Updated -

Issue

  • How to use the DenyUsers option in ssh to limit the user can only log in from a specific IP?
  • DenyUsers root@!IP become not working after OpenSSH_6.6.1p1?

Environment

  • Red Hat Enterprise Linux 5
  • Red Hat Enterprise Linux 6
  • Red Hat Enterprise Linux 7
  • Red Hat Enterprise Linux 8
  • OpenSSH

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