Hi All, -original post edited following Jesse Norell's advice below- New question ( ): I've used Let's Encrypt in the ISPConfig GUI to secure web vhosts, but never to secure the ISPConfig back end (the ISPConfig web interface, mail, FTP, etc.). Previously, I had an SSL certificate with multiple hostnames; which meant the certificate I used to secure the ISPConfig web interface (found at alpha.domain.tld) was also valid when mail/FTP/etc. clients connected via other aliases; it was also possible to secure the domain's main website by entering the certificate details in the ISPConfig panel. Is it possible for me to similarly secure multiple aliases for the back end systems using Let's Encrypt? I appreciate that I'll likely have to generate multiple certificates rather than having multiple hostnames in one certificate, but I'm not sure whether that's possible or how I'd go about it without upsetting the Let's Encrypt integration for sites hosted within ISPConfig. I'd be most grateful if someone could point me in the right direction! Many thanks, Rob.