NSCA Server - Firewall Rules
Firewall Rules These steps explain how to check if the Operating System (OS) of the Nagios server has firewall rules enabled to allow inbound NSCA TCP port 5667 traffic. The different supported OS's have different firewall commands which are exp... Read More
SNMP Trap - Firewall Rules
Firewall Rules These steps explain how to check if the Operating System (OS) of the Nagios server has firewall rules enabled to allow inbound SNMP Trap UDP port 162 traffic. The different supported OS's have different firewall commands which are... Read More
NRPE - CHECK_NRPE: Socket Timeout After n Seconds
Problem Description This KB article addresses the following NRPE error: CHECK_NRPE: Socket Timeout After n Seconds Assumed Knowledge The following KB article contains an explanation of how NRPE works and may need to be referenced to completely und... Read More
NRPE - How to install NRPE from source without xinetd on CentOS 6.
Overview This guide is intended for administrators who would like to run NRPE without using xinetd. As xinetd does provide some level of security, it is not recommended to do this. Install and Configure NRPE to run without xinetd First, we need to... Read More
NRPE - How to install NRPE
Installing NRPE Using the Install Script You must run the following commands as root. cd /tmp For CentOS & RHEL , Fedora 14+, SLES & OpenSUSE 11+, Ubuntu, Debian: wget http://assets.nagios.com/downloads/nagiosxi/agents/linux-nrpe-agent.tar... Read More
Nagios XI - Can’t Log Into The Web Interface
Problem Description Sometimes a user can connect to the Nagios XI server via ssh (putty) session but he/she is not able to log in to the web UI. Possible Causes There could be various reasons for this problem. Here are some of the possible caus... Read More
NSTI - Architecture
Overview This Article will outline and describe how Nagios SNMP Trap Interface works from the ground up. Details describe how SNMP traps are accepted in the backend, displayed in the User Interface, written to the database, and more. Much of the focu... Read More
Nagios Network Analyzer - Graph Says "No Data Available"
Problem Description The Source's graph in the summary tab of Network Analyzer says "No Data Available". Resolution This could mean one of many things. The fact that it is showing "No Data Available" means that the script that generates the gr... Read More
Nagios XI - Notification Problems
Nagios XI - Notification Problems Email Tests Send a test email to see if the Nagios server can send email to an account by going to: Configure->My Account Settings->Send Test Notifications. Then, check to see if the test email arrives. If it ... Read More
Nagios Log Server - Logs Not Searchable or Not Coming In
Overview When running a query in a dashboard, logs are not showing up when they should be. This guide will go through the steps to diagnose what is causing the issue. This article will use a scenario of a remote server sending syslogs to help provide... Read More
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