I just installed Virtualmin (6.05) via the install.sh script on a freshly set up Ubuntu Server 16.04.5. I was able to set up all of the normal things such as a domain with an alias, get a Let’s Encrypt SSL certificate, add a few user accounts, as well as send and receive emails through the Virtualmin dashboard.
Unfortunately, I cannot access the Usermin dashboard (neither http://server.fqdn.name:20000 nor https://server.fqdn.name:20000 work). Port 20000 is open on the router, FireWallD and Linux Firewall seem to be configured properly (I didn’t have to set anything as port 20000 seems to already be set up).
Any thoughts, things to check, runes to cast?