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#!/usr/bin/perl
use strict;
use warnings;
use Net::FTP 3.07;
use Net::FTP::File 0.06 ;
use IO::Socket::SSL 2.012;
use Net::SSLeay 1.68;

my $ftp = Net::FTP->new(
    'hosturl',
    Timeout         => 10,
    SSL_cert_file   => 'cacert.pem',    # dies ist die Datei aus Mozilla::CA Version 20150826
) or do { print "\$@ = '$@'"; exit(); }

Quote

d:\meinvers>perl -MIO::Socket::SSL=debug4 test_ftp.pl
DEBUG: .../IO/Socket/SSL.pm:1791: Failed to use private key
SSL error: 1896: 1 - error:0D08303A:asn1 encoding routines:ASN1_TEMPLATE_NOEXP_D2I:nested asn1 error
SSL error: 1896: 2 - error:0D0680A8:asn1 encoding routines:ASN1_CHECK_TLEN:wrong tag
SSL error: 1896: 3 - error:0D07803A:asn1 encoding routines:ASN1_ITEM_EX_D2I:nested asn1 error
SSL error: 1896: 4 - error:04093004:rsa routines:OLD_RSA_PRIV_DECODE:RSA lib
SSL error: 1896: 5 - error:0D0680A8:asn1 encoding routines:ASN1_CHECK_TLEN:wrong tag
SSL error: 1896: 6 - error:0D07803A:asn1 encoding routines:ASN1_ITEM_EX_D2I:nested asn1 error
SSL error: 1896: 7 - error:140B000D:SSL routines:SSL_CTX_use_PrivateKey_file:ASN1 lib

DEBUG: .../IO/Socket/SSL.pm:1796: Failed to use private key error:0D0680A8:asn1 encoding routines:ASN1_CHECK_TLEN:wrong tag