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Restart servers

Make sure that the firewall is up

Firewalld

systemctl status firewalld
-----returns-----
● firewalld.service - firewalld - dynamic firewall daemon
   Loaded: loaded (/usr/lib/systemd/system/firewalld.service; enabled; vendor preset: enabled)
   Active: inactive (dead)
     Docs: man:firewalld(1)

In addition, check if firewall-cmd can connect to the daemon by entering the following command:

firewall-cmd --state 
-----returns-----
running
-----if----------
not running
-----then--------
systemctl start firewalld
systemctl enable firewalld
systemctl status firewalld