yum update error: Could not retrieve mirrorlist https://mirror.webtatic.com/yum/el6/x86_64/mirrorlist error was 14: curl#60 – “SSL certificate problem: certificate has expired”

cd /etc/yum.repos.d

look for webtatic in everyfile in directory

grep -R "webtatic" .

mv webtatic.repo /tmp && mv webtatic.archive.repo /tmp

yum update