syphilis is right, you can't use more or ssh_cmd with the Net_SSH2 backend.

Do as follows: 

use Net::SFTP::Foreign 1.67;
use Net::SFTP::Foreign::Backend::Net_SSH2 0.04;

my $sftp = Net::SFTP::Foreign->new( host => 'delivery.myserver.com',
                                    port => '22',
                                    backend => 'Net_SSH2',
                                    user => 'ftp_user',
                                    key_path => "mytransaction.private
+.key");
$sftp->die_on_error("Unable to establish SFTP connection");

[download]
You will probably have to convert the private key from PuTTY to OpenSSH format and place the public key in the same directory with the .pub suffix.

In reply to Re^3: Net::SFTP::Foreign is slow by salva
in thread Net::SFTP::Foreign is slow by ssubrat77

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