![]() If your system does not have this command, you can create one manually like this: cat /etc/ssl/certs/*.pem | sudo tee /etc/ssl/certs/ca-certificates. To generate or update the file, run update-ca-certificates: sudo update-ca-certificates Run the following command to install Let’s Encrypt client (certbot) from the default Ubuntu repository. Step 3: Obtain a Trusted TLS Certificate from Let’s Encrypt. ![]() A self-signed certificate is not recommended because users will see warning like the screenshot below. The location used above is the one from Ubuntu and may vary on different systems. Now we enforced TLS, we need to obtain a valid TLS certificate. To do so, add the following line to /etc/nf (or alternatively ~/.lftp/rc, or ~/.config/lftp/rc): set ssl:ca-file "/etc/ssl/certs/ca-certificates.crt"Ĭa-certificates.crt is a file that contains all CA certificates of the system. The better solution is to configure certificate verification correctly, which is easy, fortunately. ![]() This is unsecure as it allows man-in-the-middle attacks to pass unnoticed. The web (and answers in this post) is full of suggestions to fix this by disabling certificate verification or encryption altogether. It seems like lftp is not configured correctly on many systems, which makes it unable to verify server certificates (producing Fatal error: Certificate verification: Not trusted). <- 421 Sorry, cleartext sessions are not accepted on this server. OPTS MLST type size modify UNIX.mode UNIX.uid UNIX.gid The objective is to script the access to this ftps site using bash (programming without using expect). How do I get lftp to use SSL/TLS security mechanism from the command line? I got furthest with the following parameters, but keep getting the error above. Please reconnect using SSL/TLS security mechanisms. Regardless, I keep hitting the same roadblock: 421 Sorry, cleartext sessions are not accepted on this server. I've tried giving the login creds at the command line (and putting set parameters in ~/.lftprc, then opening an lftp session and typing those parameters with lftp job control statements.
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