Disabling Port 113 IDENT Requests
You are seeing port 113 return requests either from your Nagios XI server (when submitting NSCA passive results) to the originating host OR you are seeing port 113 return requests when checking NRPE services).
You will see this behaviour on your firewall logs as you will most likely not have a firewall rule for port 113.
This is usually because you are running an NRPE check through XINETD with USERID included on the log_on_success or log_on_failure options in your remote hosts /etc/xinetd.d/nrpe file.
Further information can be found in the following link:
Then remove the USERID option from the log_on_failure AND log_on_success to stop the IDENT from occurring. The file you need to change depends on:
For example, either comment this line out or remove it completely:
# default: on
After making the changes you need to restart the xinetd service using one of the commands below:
RHEL 6 | CentOS 6 | Oracle Linux 6 | Ubuntu 14
service xinetd restart
RHEL 7 | CentOS 7 | Oracle Linux 7 | Debian | Ubuntu 16/18
systemctl restart xinetd.service
For any support related questions please visit the Nagios Support Forums at:
|Posted by: tlea - Tue, Mar 12, 2019 at 6:58 PM. This article has been viewed 1085 times.|
|Online URL: https://support.nagios.com/kb/article/disabling-port-113-ident-requests-840.html|
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