Nagios Support Forum

The specific steps I took that caused me to encounter the problem with authentication:

1. Configure /etc/nagios4/cgi.cfg to use_authentication=1.
2. sudo htdigest -c /etc/apache2/.htdigest.users "Digest Authentication" admin
3. Copy the following apache2.conf to /etc/nagios4: https://docs.google.com/document/d/1BmN ... sp=sharing
4. sudo ln -fs /etc/nagios4/apache2.conf /etc/apache2/conf-available/nagios-cgi.conf (This symlink is missing and should be enabled by default.)
5. sudo systemctl restart apache2
6. Access localhost/nagios4 through a web browser.

I expected a login prompt, but it did not appear.

use_authentication=1 is the default setting for /etc/nagios4/cgi.cfg. This appears to be broken and set to use_authentication=0 regardless of the setting.

By the way, I tested this configuration on Ubuntu Server 24.04.

Hello Travis Bean,

I will file an issue and we will investigate this matter.

Your Nagios4 login prompt issue on Ubuntu Server 24.04 likely stems from Apache not correctly loading your authentication configuration. The most probable fix is to ensure your `nagios-cgi.conf` is **enabled in Apache** using `sudo a2enconf nagios-cgi.conf` followed by a restart of Apache. Also, verify no conflicting Apache configs are active and that your custom config's directives are correctly formatted.