Hello,
I can access the WebUI locally (192.168.0.20:8443), but when accessing it externally via NoIP I get the Empty Response Error. I opened Port 8443 on my router. Do more ports need to be opened for the WebUI?
Have you checked the IP-tables on your MineOS server?
https://minecraft.codeemo.com/mineoswiki/index.php?title=Iptables
Did you only open the port on the router? Or did you also add port forwarding?
https://portforward.com/
Did you use https in the URL? (See the s in https):
https://{server name}:8443
iptables:
iptables --list
Chain INPUT (policy DROP)
target prot opt source destination
f2b-sshd tcp – anywhere anywhere multiport dports s sh
f2b-sshd tcp – anywhere anywhere multiport dports s sh
ACCEPT all – anywhere anywhere
ACCEPT tcp – anywhere anywhere tcp dpt:ssh
ACCEPT tcp – anywhere anywhere tcp dpt:8443
ACCEPT tcp – anywhere anywhere tcp dpt:25565
ACCEPT all – anywhere anywhere state RELATED,ESTA BLISHED
ACCEPT tcp – anywhere anywhere tcp dpt:8123
Chain FORWARD (policy ACCEPT)
target prot opt source destination
Chain OUTPUT (policy ACCEPT)
target prot opt source destination
Chain f2b-sshd (2 references)
target prot opt source destination
RETURN all – anywhere anywhere
RETURN all – anywhere anywhere
But that shouldn’t really make a difference, since it works internally, but not externaly, right?
I double checked, yes it forwards, and isn’t just open.
3rd, easiest, dumbest of me and the right solution was to write https. Thanks very much for some idiot help 
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