Overview This KB article explains how you can troubleshoot Active Directory (AD) and Lightweight Directory Access Protocol (LDAP) authentication issues. The troubleshooting methods are similar across Nagios Log Server, Network Analyzer and xi... Read More

Forwarding Logs from Nagios Log Server If necessary, you can forward all of the logs from your Nagios Log server to a different server by creating a new output in NLS. To create a new output: In NLS, navigate to Configure > Global Config. Click... Read More

Overview In larger enterprises, a "standard build" of CentOS or RHEL is required based on internal policies. These often differ from a clean minimal install of the OS as per our requirements. Depending on the policies implemented in the build process... Read More

Problem Description Logs are not coming in and you see an error like this in the Logstash log: :response=>{"create"=>{"_index"=>"logstash-2019.12.13", "_type"=>"syslog", "_id"=>"AW8Ab04im8e-JsUH61c5", "status"=>400, "error"=>... Read More

Problem Description When you click the Administration menu the page fails to load and you receive a HTTP 500 error.     Editing Files In this article you will be required to edit files. This documentation will use the vi text editor. When using the... Read More

Problem Description This KB addresses issues that can occur when activating your license. After entering your license key you still receive the banner at the top of the page saying "Your license has not yet been activated.".   Resolution This issue... Read More

Problem Description When entering in your license key in Nagios Log Server, after clicking the Set Key button the screen refreshes and the license key you just entered is not shown.   Resolution To resolve this problem you will need to enter the... Read More

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

Overview After upgrading to Nagios Log Server 2.0, the logstash service doesn't remain running.   Diagnosis The /var/log/logstash/logstash.log file will show a message similar to: {:timestamp=>"2017-11-14T08:24:17.314000-0700", :message=>... Read More

Problem Description You experience problems with the Logstash process dying. On the console of your server you observe the following:: INFO: [6a7ce4ea-e1b9-47a1-af18-1c4d47243d20] failed to get node info for [#transport#-1][sa585][inet[localhost/127... Read More

Problem Description You will observe that sometimes filters that are added to a search contain a newline (\n) character to the filter and due to this no results are found.     Explanation In this screenshot, you can see that from an event,... Read More

Problem Description You do not know the password for the nagiosadmin account and need to reset it.   Resetting The Password Open an SSH or direct console session to your Nagios Log Server host and execute the following command: /usr/local... Read More

Problem Description When you are using rsyslog to send JSON formatted data to Nagios Log Server, the data is not being correctly processed. Here is a screenshot that demonstrates the problem:     As you can see, the message field shows the data is... Read More

Overview This article explains how to troubleshoot backups in Nagios Log Server. There are two methods in which you can diagnose backup issues: Watching the log server job logs and forcing a backup Using the command line to execute backups  ... Read More

Troubleshooting Commands This is a list of commands that can be used to help diagnose issues with Nagios Log Server. Be careful, some commands can be destructive and can result in data loss!     Generic Information Gathering Master: curl '... Read More

Overview If one of your Linux hosts is running SELinux and rsyslog, you may be running into issues receiving logs from from this host on one of your Nagios Log Server nodes. This article will show you how to resolve this problem. In this article: ... Read More

Problem Description Nagios Log Server is in a red health state. You can see the current cluster state by navigating to (Administration -> Cluster Status):     The cluster can be in one of three states: Green: All primary and replica shards are... Read More

Problem Description Nagios Log Server is in a yellow health state. You can see the current cluster state by navigating to Admin > System > Cluster Status:     The cluster can be in one of three states: Green: All primary and replica shards... Read More

Problem Description After rebooting one of your Nagios Log Server (NLS) instances you receive the following message on the NLS web page: Waiting for Database StartupIt looks like your local elasticsearch service is starting.Why am I getting this... Read More

Problem Description The Nagios application is not displaying the correct information. This commonly occurs after applying an update to the Nagios program.   Explanation Your web browsers cache has not been refreshed with the latest code since the... Read More

Description Nagios Log Server is a useful way to search and store large amounts of data however the start up process is resource intensive and may take some time to complete.  If your instance of Log Server presents the message "Waiting for Database... Read More

Problem Description In rare circumstances you may come across the following error in your web browser when accessing one of the Nagios products: Content Encoding ErrorThe page you are trying to view cannot be shown because it uses an invalid or... Read More