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Why does uninstall script for PowerChute Network Shutdown 4.2+ not properly clean up firewalld on RHEL 7.3+ and CentOS 7.3+?

uninstall script for PowerChute Network Shutdown 4.2 and above does not properly clean up firewalld on RHEL 7.3 and above and CentOS 7.3 and above.

PowerChute Network Shutdown version 4.2, and above

RHEL 7.3 and CentOS 7.3

From RHEL 7.3 release notes, firewalld packages have been upgraded to provide some enhancements over its previous version. Which includes changes in the firewall-cmd, firewall-offline-cmd, firewall-config, and firewall-applet.

After running the PowerChute uninstall script run the command

firewall-cmd --remove-service=pcns --permanent
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