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Nagios web interface not loading – How we fix it?

by | Jan 23, 2021

Stuck with Nagios web interface not loading? We can help you fix it.

Commonly this error occurs after an upgrade or during installation.

At Bobcares, we often receive requests regarding Nagios errors as part of our Server Management Services.

Today, let’s discuss how our Support Engineers resolve Nagios web interface not working.


Causes for Nagios web interface not loading problem

This error commonly occurs when we upgrade the Nagios and PHP is not updated in the server.

It can also occur if the web interface not configured properly.

If there is a problem with web server configuration Nagios GUI fails to load.

Let us discuss how our Support Engineers fix Nagios web interface not working.


How to fix Nagios web interface not loading problem?

Recently one of the customers approached us saying that Nagios web interface is not working after the upgrade. Let us discuss how our Support Engineers resolve it.


Update PHP version

This error commonly occurs when we upgrade to the newer version of Nagios. On upgrading to the latest version the requirement for the version needs to be met.

One of the major reason are the PHP version in the server is not up to date.

Thus, on checking the server found that the PHP was not up-to-date. Thus, we update the PHP to the latest version. Upgrading the PHP version in the server might affect the site running with a lower PHP version. If websites are running on the server.

Thus are Support Engineers take the required safety before upgrading to the latest version.


Web interface not configured properly in Nagios

This can also occur after Nagios installation. In those cases, the web interface is not installed properly.

Thus, our Support Engineers make sure that the web interface is installed in the server.

Else we install the web interface using the command

sudo make install-webconf

Then we check the nagios.conf file is present in the Apache folder. In the Ubuntu server, the configuration file needs to be present in the sites-enabled folder. Thus, we found the file was not present in the location.

Thus, from the installation folder, we run the command to move the file to the correct location.

sudo /usr/bin/install -c -m 644 sample-config/httpd.conf /etc/apache2/sites-enabled/nagios.conf

Finally, we restart the Apache server using the command

service apache2 restart

After restarting the service the Nagios web interface starts to load.

Web server configuration in Nagios

The Nagios interface will fail to load if there is an issue with the webserver. Thus are Support Engineer the configuration using the command

apachectl configtest

For the Nginx server, we use the command

nginx -t

Thus, our Support Engineers analyze the result and resolve the error in the webserver and make the Nagios web interface to load.

[Need assistance with Nagios error – We can help you with it]



In short, we have discussed the causes for Nagios web interface not loading. Also, we have discussed how our Support Engineer resolves it for customers.


Never again lose customers to poor server speed! Let us help you.

Our server experts will monitor & maintain your server 24/7 so that it remains lightning fast and secure.


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