curl: (60) SSL certificate problem: unable to get local issuer certificate

Question

root@sclrdev:/home/sclr/certs/FreshCerts# curl --ftp-ssl --verbose ftp://{abc}/ -u trup:trup --cacert /etc/ssl/certs/ca-certificates.crt
* About to connect() to {abc         


        

Answer 1

You have to change server cert from cert.pem to fullchain.pem
I had the same issue with Perl HTTPS Daemon:
I have changed:
SSL_cert_file => '/etc/letsencrypt/live/mydomain/cert.pem'
to:
SSL_cert_file => '/etc/letsencrypt/live/mydomain/fullchain.pem'