Comments on How to install ProFTPD with TLS on Ubuntu 18.04 LTS

Is it possible to use Let's Encrypt instead of openssl?

Asau: OpenSSL is the TLS library used by Linux. Has nothing to do with Let's Encrypt. That said, I use Let's Encrypt certs with my ProfTPD servers with no problems.

Awesome thanks so much, it's working!

I had to change the rsa key size to 2048 bits because with FileZilla, the Server was returning and logging a TLS error of: 'SSL_CTX_use_certificate:ee key too small'.So I used this to re-create the key and cert and it works now:

openssl req -x509 -newkey rsa:2048 -keyout /etc/ssl/private/proftpd.key -out /etc/ssl/certs/proftpd.crt -nodes -days 365

Is it possible to use Let's Encrypt instead of openssl?