iptables: No config file. [WARNING]

service iptables start

iptables: No config file. [WARNING]

Resolution
a mitigation is to run, as root, the following 3 commands:
yum install system-config-firewall-base
lokkit --default=server
service iptables restart
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How to fix: ERROR 1045 (28000): Access denied for user ‘root’@’localhost’ (using password: YES)

Open your terminal and type mysql -u root -p Enter your password. Hopefully your MySQL is logged in now.