SLES 15
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Initial Settings : FireWall2019/01/14

[1] It's possible to show Service Status of FireWall like follows. (enabled by default)
localhost:~ #
systemctl status firewalld

*  firewalld.service - firewalld - dynamic firewall daemon
   Loaded: loaded (/usr/lib/systemd/system/firewalld.service; enabled; vendor p>
   Active: active (running)
     Docs: man:firewalld(1)
 Main PID: 823 (firewalld)
    Tasks: 2 (limit: 4915)
   CGroup: /system.slice/firewalld.service
           +---823 /usr/bin/python3 -Es /usr/sbin/firewalld --nofork --nopid
.....
.....
# [Active: active (running) ***] means firewalld is running now

[2]
If you use FireWall service, it needs to modify settings of it because incoming requests for services are mostly not allowed by default. Refer to here to basic operation and settings to configure firewalld service (for CentOS 7).
[3] If FireWall service does not need for you because of some reasons like that some FireWall Machines are running in your Local Netowrk or others, it's possbile to stop and disable it like follows.
# stop service

localhost:~ #
systemctl stop firewalld

# disable service

localhost:~ #
systemctl disable firewalld

Removed /etc/systemd/system/multi-user.target.wants/firewalld.service.
Removed /etc/systemd/system/dbus-org.fedoraproject.FirewallD1.service.
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