Can't access Virtualmin on port 10000

After installing tls1_3 on my Ubuntu Apache Server I can’t access Virtualmin/Webmin on port 1000 anymore from any browser.
Previously I’ve got the option to make an exception in advanced options, however, it disappeared as well.

I have ufw deactivated, I use csf instead, and I have properly setup the ports in csf.conf as well:

Allow incoming TCP ports

TCP_IN = “20,21,22,25,53,80,110,143,443,465,587,993,995,10000,20000”

Allow outgoing TCP ports

TCP_OUT = “20,21,22,25,53,80,110,113,443,587,993,995,10000,20000”

Can anyone help?