"The SSL certificate failed verification" error while running yum

Issue symptoms

Yum is not working producing the following error:

$ yum check-update

The SSL certificate failed verification.

Cause and resolution

Please check the following causes: 1. Server time should be correct, could be checked with

ntpdate -qv pt.pool.ntp.org

2. The server should be able to resolve repo/cln websites properly, if you use custom resolvers - disable them in /etc/resolv.conf and set 8.8.4.4 :

nameserver 8.8.4.4