The following is a truncated excerpt of the error.
An error has been encountered in accessing this page.
1. Server: webmin.com
2. URL path: /docs/modules/securing-webmin
3. Error notes: NONE
4. Error type: 404
5. Request method: GET
6. Request query string: NONE
7. Time: 2025-10-29 09:49:09 UTC (1761731349)
It also mentions about adding Options +Indexes to the .htaccess.
According to the WayBackMachine it’s been 404 for months now. There are no viable copies nor archives which I could locate.