When you come across this error "LDAP Error: Connect error: TLS error -8054:You are attempting to import a cert with the same issuer" enrolling a client to FreeIPA/IDM server, it means that the existing certificate does not match the one on the IDM server and can be fixed quite easily with just one command. The scenario in which this can happen is that you might have had the client enrolled to a different IDM server previously and the old cert is still lying around.

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When trying to get the custom time range for PNP4Nagios graphs, it might result in an error "application/models/data.php [664]:". It can easily resolved by editing "system.php"  in PNP4Nagios controllers folder. To start with first make a backup of the file.

# cp -a /usr/local/pnp4nagios/share/application/controllers/system.php /usr/local/pnp4nagios/share/application/controllers/system.php.bkp
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Its now possible to install the latest version of Nagios NRPE v 3.0.1 (source install) on RaspberryPi (incl. Pixel OS). Just follow this simple article and you will be up and running with NRPE on Nagios clients as well as on the Nagios server which needs to communicate to clients via nrpe agent. This guide is valid for Raspbian Jessie and the latest version that is Raspbian Pixel OS.

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