Thanks @Chris_UK . I guess I am a little confused when you say to run the installer in "interactive mode". The problem I have is the second server is already fully installed running in all services except the Panel on 8080. Is there a way to Re-run the ISPConfig installer again without messing everything up to have the certificate re-issued? If there is a way to have the ACME.SH client request a LE certificate without having to re-run the installer, I'll do that but I think I read the "symlinks" created by the installer script was basically the only reason why the installer/updater has to be re-run when requesting initial SSL certs. To get a valid certificate on secondary server, would it be possible to have the primary server (node01) use only IPv4 DNS records and only IPv6 DNS Records for secondary server (node02)? Or should I just de-activate node02 until I have my business circuit installed with plenty of public IPs and proper firewall. This is only a Proof of concept for funding and SSL seems to be my only issue. The production environment will not have the limitations of my current environment. Does what I am saying make sense?