I'm using CentOS-7 and configuring two servers to run OTRS System, but the Database Server Firewall "Firewalld" is dropping the Application Server requests for RDA "Remote Database Access". Because when i stop the firewalld service, database is accessed successfully. How can i make an exception for the RDA Process through the Firewalld?
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Yeah I solved it. In the Database Server i added the mysql service instead of the protocol RDA to the firewall rules using the strong rule:
firewall-cmd --add-rich-rule 'rule family="ipv4" source address="$APPLICATION_IPV4_ADDRESS" service name="mysql" accept' --permanent`
Or you can simply open MySQL port for all IPs "not recommended" as follows:
firewall-cmd --zone=public --add-service=mysql --permanent
Best Luck,

Shnbook
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