As a complex system, a reverse proxy or a WAF can lead you to troubleshooting scenarios that require a lot of logs reading along with some web server and application knowledge. Here, we will explore a few tools that might help you to solve a quest.

Testing for configuration issues

Sometimes, even with all of the help and automations that the webGUI plugin frontend has, some configuration issues could appear, making the NGINX service unable to start. To test the NGINX configuration, you can log in to the OPNsense CLI and run the following command:

root@OPNsense-1:~ # nginx -t
nginx: the configuration file /usr/local/etc/nginx/nginx.conf syntax is ok
nginx: configuration file /usr/local/etc/nginx/nginx.conf test is successful

For a more complete testing and configuration output, you can also run nginx -t.

Logs reading

In the webGUI, we find the NGINX | Logs menu. Inside this page, it is possible to check every created HTTP server log file and the NGINX...