Zabbix Agent No Active Checks on Server Host Not Found

Hello Dev, if you are reading this article, then you must be familiar with Zabbix monitoring. Zabbix is an open-source monitoring tool that helps to monitor the health and performance of your IT infrastructure. However, sometimes, you might face an issue where the Zabbix agent is not able to perform active checks on the server host, and you get the “not found” error. In this article, we will discuss this issue in detail and provide solutions to resolve it.

Understanding Zabbix Agent and Active Checks

Zabbix agent is a piece of software that needs to be installed on the server host that you want to monitor. The agent collects various metrics and sends them to the Zabbix server, which processes the data and presents it in a graphical manner. Active checks are a type of check that the Zabbix agent can perform on the server host to collect data. These checks are initiated by the Zabbix server, and the agent responds with the data. Active checks are useful when you want to collect real-time data or when you want to monitor a specific aspect of the server host.

What Causes Zabbix Agent No Active Checks on Server Host Not Found Error?

There could be several reasons why you are getting the “not found” error when the Zabbix agent is trying to perform active checks on the server host:

How to Fix Zabbix Agent No Active Checks on Server Host Not Found Error?

Check Firewall Rules

The first step is to check the firewall rules on the server host and Zabbix server to ensure that they are not blocking the port used by the Zabbix agent. You can use the following command to check the firewall rules:

iptables -L

If the port used by the Zabbix agent is blocked, then you need to open the port using the following command:

iptables -A INPUT -p tcp --dport -j ACCEPT

Check Hostname and IP Address

You need to ensure that the hostname or IP address used by the Zabbix agent is correct. You can use the ping command to verify that the hostname or IP address is reachable:

ping

If the ping command fails, then you need to check the DNS settings and ensure that the hostname or IP address is correct.

Check Zabbix Agent Configuration

You need to ensure that the Zabbix agent is configured correctly. The Zabbix agent configuration file is located in the /etc/zabbix/zabbix_agentd.conf directory. You can use the following command to check the configuration file:

cat /etc/zabbix/zabbix_agentd.conf

If there are any errors in the configuration file, then you need to correct them and restart the Zabbix agent.

Check Zabbix Server Configuration

You need to ensure that the Zabbix server is configured correctly. The Zabbix server configuration file is located in the /etc/zabbix/zabbix_server.conf directory. You can use the following command to check the configuration file:

cat /etc/zabbix/zabbix_server.conf

If there are any errors in the configuration file, then you need to correct them and restart the Zabbix server.

Check Zabbix Server Availability

You need to ensure that the Zabbix server is running and is available over the network. You can use the following command to check the status of the Zabbix server:

systemctl status zabbix-server

If the Zabbix server is not running, then you need to start it using the following command:

systemctl start zabbix-server

FAQs

1. What is Zabbix agent?

Zabbix agent is a piece of software that needs to be installed on the server host that you want to monitor. The agent collects various metrics and sends them to the Zabbix server, which processes the data and presents it in a graphical manner.

2. What are active checks in Zabbix?

Active checks are a type of check that the Zabbix agent can perform on the server host to collect data. These checks are initiated by the Zabbix server, and the agent responds with the data.

3. Why am I getting the “not found” error when the Zabbix agent is trying to perform active checks on the server host?

The “not found” error occurs when the Zabbix agent is not able to perform active checks on the server host. This could be due to firewall rules, incorrect hostname or IP address, incorrect configuration, or Zabbix server unavailability.

4. How can I fix the Zabbix agent no active checks on server host not found error?

You can fix the error by checking the firewall rules, hostname and IP address, Zabbix agent configuration, Zabbix server configuration, and Zabbix server availability.

5. Where is the Zabbix agent configuration file located?

The Zabbix agent configuration file is located in the /etc/zabbix/zabbix_agentd.conf directory.