Description of problem:
The firewall rule in the below link under "⁠13.2.3. Configure NRPE" differs  from description.

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https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux_OpenStack_Platform/5/html/Installation_and_Configuration_Guide/sect-Configure_Nagios.html
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The description points the port should be open for UDP but the rule is gove n for tcp so there is a difference between the description and example.
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    Add an INPUT rule allowing UDP traffic on port 5666 to this file. The new rule must appear before any INPUT rules that REJECT traffic.

    -A INPUT -p tcp --dport 5666 -j ACCEPT

    Save the changes to the /etc/sysconfig/iptables file.
    Restart the iptables service for the firewall changes to take effect.

    # service iptables restart

For Red Hat Enterprise Linux 7-based systems, run the following commands:

# firewall-cmd --permanent --add-port=5666/udp
# firewall-cmd --add-port=5666/udp
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Version-Release number of selected component (if applicable):


How reproducible:


Steps to Reproduce:
1.
2.
3.

Actual results:
The example and the description does not match.


Expected results:
The description of rule should match.
Either it should be tcp or UDP

Additional info:
In a case customer reported that the NRPE was using tcp.