Hi ElFroggio,
As a last hope I would try this.
Using Reverse Rroxy on the main server to redirect Internet traffic to the local server.
At your Register, add a CNAME record for ethelbert that point to the public IP of 911networks.com
In Server Manager on local server, create domain: ethelbert.911networks.com with the DNS Servers: from the Internet.
Configuration of the main server 911networks.com as a Reverse Proxy
# db domains set ethelbert.911networks.com domain
# db domains setprop ethelbert.911networks.com Nameservers internet
# db domains setprop ethelbert.911networks.comt ProxyPassTarget http://LOCAL_IP_OF_ethelbert.911networks.com
# db domains setprop ethelbert.911networks.com TemplatePath ProxyPassVirtualHosts
# signal-event domain-create micronator-101.ddns.net
On main server, check with Server Manager and the domain ethelbert.911networks.com should be there.
# db domains show
...
ethelbert.911networks.com=domain
Nameservers=internet
ProxyPassTarget=http://LOCAL_IP_OF_ethelbert.911networks.com/
TemplatePath=ProxyPassVirtualHosts
...
# ping -c 2 ethelbert.911networks.com
INSTALL "TOR" AND GOTO:
https://www.ethelbert.911networks.comInstall Let's Encrypt on the local machine and ask for a TEST certificate.
Let's Encrypt will send the challenge to ethelbert.911networks.com and the local server will answer.
*** UNINSTALLING ***
On main server: 911networks.com
# db domains delete ethelbert.911networks.com
# signal-event domain-modify
# db domains show | grep ethelbert.911networks.com
I tried this scenario before on a local server to test certificate from Let's Encrypt and it worked.
Michel-André