Cannot install packages via YUM ger Error: "certificate verify failed"

Solution Verified - Updated -

Issue

I get the following error when try to install via yum:

yum install gcc-c++ gcc
Loaded plugins: product-id, rhnplugin, security, subscription-manager
This system is not registered to Red Hat Subscription Management. You can use subscription-manager to register.
This system is receiving updates from RHN Classic or RHN Satellite.
Error: certificate verify failed

Environment

  • Red Hat Enterprise Linux 5.9

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