Cloudflare only has a few open ports allowed. You will need to look that up on Cloudflare docs.
You have 2 choices:
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In Cloudflare dns panel I believe you can change the A record for your host from proxy to direct. (something along those lines, I think if I recall it just being a button to click next to the record)
-
Change your webmin port to one that Cloudflare has open for proxy such as port 8443. (This option I don’t recommend if you are using fail2ban to block unauthorized logins.)
Edit to add the link for Cloudflare docs on ports: