Let's Encrypt & Serv-U

Hi lneibauer​,

I can confirm that a Let's Encrypt certificate will work with Serv-U, however you would usually run through some OpenSSL or some other tool to generate a private key and self-signed certificate for your local server.

Luckily for you, you can use the certificate tool within Serv-U to create a self-signed certificate and private key instead of generating them yourself, here's a guide to run you through this: Creating A Self-Signed Certificate In Serv-U

After you have your self-signed certificate and private key you'll need to get the Let's Encrypt certificate to verify and trust yours so you can then put it into Serv-U. The last section on the Serv-U article link I sent you mentions the usual process you'll be aiming upload the CSR from your certificate to Let's Encrypt who should then provide you the certificates back with their authenticated certificates.

It's both simple and complicated at the same time, until you've done it once it will seem difficult. I would recommend researching about working with certificate authorities and the general understanding of certificates.

Also, you should be using a minimum of SHA-256 (2048 key length) as browsers no longer deem anything lower as secure.

-Midnight