DLP on RHEL: How to open firewalld ports.

Products

• Data Loss Prevention

Issue/Introduction

How to open firewall ports in firewalld on RHEL 7/8/9

Environment

RHEL 7/8/9

Resolution

Log into the rhel server physically or ssh to the server. 

firewall-cmd --get-services 

if the service is listed whitelist the service by adding it to the current zone:

sudo firewall-cmd --permanent --add-service=SERVICENAME

If the service is not listed add the port to the current zone.

sudo firewall-cmd --permanent --add-port=1234/tcp

The firewalld needs to be re-loaded or restarted to apply the changes:

firewall-cmd --reload

To verify the current open ports and services:

firewall-cmd --list-all