Johnex
2
When using TLS you need to verify the certificate of the server. That is what the error is saying, could not verify the certificate. You need to edit the /etc/lftp.conf file and add this line:
set ssl:ca-file "/etc/ssl/certs/ca-certificates.crt"
You must then also copy the ca of the server to your router as /etc/ssl/certs/ca-certificates.crt
Should work after that 