About Let's Encrypt: It is a certificate authority that provides certificates (only domain-validated certificates) for free. (for more info : https://letsencrypt.org/how-it-works/)
 
With this plugin you are able to create a java key store file (the .JKS file) authorized by the Let's Encrypt certificate authority.

If the DMZ will do public key authentication, in the user manager, set the public key path for this 'template' user to be just the three letters in uppercase: DMZ.  This will allow automatic public key verification based on keys configured on the internal server to be validated on the DMZ as well.

[attachments|dmz_publickey.png]

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!No prefs are stored on the DMZ server.