How to resolve the issue of Nagios’ web page authentication not working?

2 years ago
Benjamin Taylor
3 minutes

If the Nagios web page cannot be opened, it may be due to several reasons.

  1. Nagios service not started: First, make sure the Nagios service has been properly started. You can check the status of the Nagios service using the following command:
  2. Check the status of Nagios with systemctl.
  3. If the service is not started, you can use the following command to start the Nagios service:
  4. Start nagios using systemctl.
  5. Firewall is preventing access: If your system has firewall enabled, it may block access to the Nagios web page. You can resolve this issue by opening the Nagios web port on the firewall. By default, Nagios web page uses port number 80 (HTTP) or 443 (HTTPS). You can open the port using the following command.
  6. – Open HTTP by running “sudo ufw allow 80”
    – Open HTTPS by running “sudo ufw allow 443”
  7. Nagios configuration error: If there are errors or incorrect configurations in Nagios’ configuration files, it may cause the web page to not open. You can check if the syntax of the Nagios configuration file is correct using the following command:
  8. Check the configuration of Nagios by running the command:
    sudo /usr/local/nagios/bin/nagios -v /usr/local/nagios/etc/nagios.cfg
  9. If any errors are detected, please make the necessary corrections based on the error message and restart the Nagios service.
  10. The Nagios web page cannot be accessed because the web server (such as Apache or Nginx) is not running. Make sure your web server is properly installed, configured, and running. You can check the status of the web server using the following command.
  11. Check the status of Apache if using it as a web server, and check the status of Nginx if using it as a web server.
  12. If the Web server is not running, you can start the Web server using the following command:
  13. please start Apache using systemctl if you are using it as your web server. Please start Nginx using systemctl if you are using it as your web server.
  14. Ensure that the permissions of Nagios web page files are set correctly. By default, Nagios web page files are located in the /usr/local/nagios/share/ directory. You can use the following command to change file permissions.
  15. Change the ownership of the /usr/local/nagios/share/ directory to nagios:nagios and set the permissions to 755.

If the issue still cannot be resolved, please check the log files of Nagios and its related components for more detailed error information.

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