Securing Plesk 12 admin or higher with Lets Encrypt SSL
How to secure Plesk 12 admin using Let's Encrypt
For those unfamiliar with "Let's Encrypt" its an addon that comes integrated with newer versions of Plesk allowing one to encrypt any site and/ or subdomain with SSL for free. So of course lets start with taking the opportunity to secure your Plesk panel which should only take a few minutes if that.
1) Log into Plesk. *
If you're logging in under the IP address ie 123.123.133/etc you're doing it wrong. Instead choose the domain and port https://mydomain.com:8443
This should take you to your plesk login screen.
2) Goto domain plesk is on.
For 1and1 users it looks something like subdomain.onlinehome-server.com
3) Choose Let's Encrypt option
Simply ad an email as requested and submit form. If all goes well you'll have a success message.
4) Goto "tools & Settings > SSL/TLS Certificates"
From here there should be an option asking which certificate to secure plesk, simply point it to certificate that was just created.