Even if I log in to Webmin or Usermin the correct way with SSL it gives a error in miniserv.error log like this:
[27/Aug/2006:00:57:29 +0200] [xxx.xxx.xxx.xxx] Bad Request : This web server is running in SSL mode. Try the URL https://xxx.xxx.xxx.xxx:10000/ instead.
It does not matter if I use https://xxx.xxx.xxx.xxx:10000 or https://server.domain.tld:10000 the "bad reqline" shows up every time someone logs in to Webmin or Usermin, the error shows up as soon as the login page are shows up on the screen.
The message "This server is..." only shows up in the error log, the login page is the normal login page.