Nagios Support Forum

Software: nrpe v3.1.1-2

OS: RHEL 6.9

I am using the default configuration file /etc/nagios/nrpe.cfg with the following key/value:
allowed_hosts=127.0.0.1,::1

The message apears in /var/log/messages when the nrpe service is started:
... nrpe[20187]: add_ipv4_to_acl: Error, ip-address >::1< incorrect length

The message does not appear if I use the following key/value instead in /etc/nagios/nrpe.cfg:
allowed_hosts=127.0.0.1

Check out this Github issue:
https://github.com/NagiosEnterprises/nrpe/issues/128

You might try updating to the latest version of NRPE, which is 3.2.0 as of this post, and see if that fixes the issue.

mcapra wrote:Check out this Github issue:
https://github.com/NagiosEnterprises/nrpe/issues/128

You might try updating to the latest version of NRPE, which is 3.2.0 as of this post, and see if that fixes the issue.

Correct, the previous version wasn't accounting correctly for IPv6 addresses

Thank you for the quick response, it's greatly appreciated!

I will update nrpe to v3.2.0 or greater once fedora/red hat generate rpms. (Project policy requirement).

no problem.