Accessing Webmin through Cloudflare


I’m trying to access Webmin through cloudflare (Authenticated Origin Pulls active, as I’m working on a server ).

I’m getting to the login page (after changing webmin port to 2087, because cloudflare does not implements port 10000 in free plan), but the login button seems not to work properly, as nothing happens when I press it.

Anyone has done this before?

Thank you,