Centos: Solving SSL connection error to EPEL repository

the old Centos version like 6.X is commonly have encounter following error message while connecting to epel repository:

Could not get metalink https://mirrors.fedoraproject.org/metalink?repo=epel-6&arch=x86_64 error was
14: problem making ssl connection

 
Root cause of this issue is old distribution of package certificate authority, ssl and nss. Then update these packages may fix it. 
# you may disable epel repo if it's blocking to update the latest package list
yum check-update
yum update ca-certificates openssl nss-*
Then try to access the epel mirror list site using curl, make sure it's can grab the HTML content.
curl -v https://mirrors.fedoraproject.org

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