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Zabbix agent on Zabbix server is unreachable for 5 minutes – We’ll fix it

Receiving an error ‘Zabbix agent on Zabbix server is unreachable for 5 minutes’? We can help you fix it.

Often, ‘zabbix agent unreachable for 5 minutes’ error happens due to some bad settings in the Zabbix config file.

At Bobcares, we often get requests from our customers to fix this problem as part of our Server Management Services.

Today, we’ll discuss the reasons for this error to occur and see how our Support Engineers fix this error.


How to fix  ‘Zabbix agent on Zabbix server is unreachable for 5 minutes’ ?

At Bobcares, where we have more than a decade of expertise in managing servers, we see many customers facing this problem while managing Zabbix.

Now, let’s see the major reasons for this Zabbix error and how our Support Engineers fix this.


 Incorrect ServerActive address

Recently one of our customers approached us with the same zabbix problem. He said he is getting an alert  like the one shown below in his zabbix dashboard.


Zabbix agent on Zabbix server is unreachable for 5 minutes1


Our Support Engineers checked and found that the ServerActive address is not changed to zabbix-server IP address in configuration file. So we changed it to Zabbix-server IP.

We made the changes in:


and restarted the service using:

service zabbix-agent restart

This fixed the issue.

Incorrect Host settings

We also handled a situation where the customer was facing the same error. But when checked we found that the SeverActive address was given correctly.

So, we checked further in detail and found that  in zabbix panel  >> configuration >> Hosts >> zabbix server (as shown in the figure below) section, DNS name was not given as zabbix-agent. So we changed DNS name to ‘zabbix-agent’ and saved.


Zabbix agent on Zabbix server is unreachable for 5 minutes2


This fixed the problem. That’s it.


[Having trouble in solving Zabbix related errors? We’ll fix it for you.]


In short, Zabbix agent unreachable for 5 minutes problem occurs due to some changes in configuration file, in host settings etc. Today, we discussed some of them and saw how our Support Engineers fixed the problem.


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