Why yum returns ”No packages needed for security” when referring to a local repository server

Solution Verified - Updated -

Issue

  • The system is referring a local repository server, yum install works well, but when execute yum check-update --security, it returns No packages needed for security.
# yum check-update --security
<skip...>
No packages needed for security; 809 packages available
#

Environment

  • Red Hat Enterprise Linux 6
  • Red Hat Enterprise Linux 7

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