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

Solution Verified - Updated -

Issue

  • My system is referring a local repository server, "yum install "works find, but when I run "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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