use strict;
use warnings;

use Net::SFTP::Foreign;

my $host = '*mycompany*@*client_ftp_IP*';

my %args = ('ssh_cmd'  => 'C:\Program Files\PuTTY\plink',
            );

my $sftp = Net::SFTP::Foreign->new(
	$host,
	%args,
	more => [
        -P => '*connection port*',
		-i => 'G:\FTP\id_cmf_mediatechid_cmf_mediatech.ppk',
        -ssh,
        '-v',
	]
);

$sftp->error and
   die "Unable to stablish SFTP connection: " . sftp->error;


$sftp->get("foo", "bar") or die "get failed: " . sftp->error;

$sftp->put("bar", "baz") or die "put failed: " . sftp->error;

##</code><code>##

Looking up host "*client_ftp_IP*"
Connecting to *client_ftp_IP* port *connection port*
Server version: SSH-2.0-OpenSSH_5.1
We claim version: SSH-2.0-PuTTY_Release_0.60
Using SSH protocol version 2
Doing Diffie-Hellman group exchange
Doing Diffie-Hellman key exchange with hash SHA-256
Host key fingerprint is:
ssh-rsa 2048 *FINGERPRINT KEY*
Initialised AES-256 SDCTR client->server encryption
Initialised HMAC-SHA1 client->server MAC algorithm
Initialised AES-256 SDCTR server->client encryption
Initialised HMAC-SHA1 server->client MAC algorithm
Reading private key file "G:\FTP\id_cmf_mediatech\id_cmf_mediatech.ppk"
Using username "mycompany".
Offered public key
Offer of public key accepted
Authenticating with public key "rsa-key-20081029"
Access granted
Opened channel for session
Server refused to start a shell/command
FATAL ERROR: Server refused to start a shell/command
Unable to stablish SFTP connection: Connection to remote server is broken at C:\PROGRA~1\OpenSSH\usr\sbin\test.pl line 24.


==============================

##</code><code>##

use strict;
use warnings;

use Net::SFTP::Foreign;

my $host = '*mycompany*@*client_ftp_IP*';

my %args = ('ssh_cmd'  => 'C:\Program Files\OpenSSH\bin\ssh',
            );

my $sftp = Net::SFTP::Foreign->new(
	$host,
	%args,
	more => [
        -p => '*connection port*',
		-i => 'C:\Documents and Settings\.ssh\id_cmf_mediatech',
        '-v',
	]
);

$sftp->error and
   die "Unable to stablish SFTP connection: " . $sftp->error;

##</code><code>##

OpenSSH_3.8.1p1, OpenSSL 0.9.7d 17 Mar 2004
debug1: Reading configuration data /etc/ssh_config
debug1: Connecting to *client_ftp_IP* [*client_ftp_IP*] port <connection port>.
debug1: Connection established.
debug1: identity file C:\\Documents and Settings\\.ssh\\id_cmf_mediatech type -1
debug1: Remote protocol version 2.0, remote software version OpenSSH_5.1
debug1: match: OpenSSH_5.1 pat OpenSSH*
debug1: Enabling compatibility mode for protocol 2.0
debug1: Local version string SSH-2.0-OpenSSH_3.8.1p1
debug1: SSH2_MSG_KEXINIT sent
debug1: SSH2_MSG_KEXINIT received
debug1: kex: server->client aes128-cbc hmac-md5 none
debug1: kex: client->server aes128-cbc hmac-md5 none
debug1: SSH2_MSG_KEX_DH_GEX_REQUEST(1024<1024<8192) sent
debug1: expecting SSH2_MSG_KEX_DH_GEX_GROUP
debug1: SSH2_MSG_KEX_DH_GEX_INIT sent
debug1: expecting SSH2_MSG_KEX_DH_GEX_REPLY
debug1: Host '<client_ftp_IP>' is known and matches the RSA host key.
debug1: Found key in /home/.ssh/known_hosts:1
debug1: ssh_rsa_verify: signature correct
debug1: SSH2_MSG_NEWKEYS sent
debug1: expecting SSH2_MSG_NEWKEYS

debug1: SSH2_MSG_NEWKEYS received

debug1: SSH2_MSG_SERVICE_REQUEST sent
debug1: SSH2_MSG_SERVICE_ACCEPT received
debug1: Authentications that can continue: publickey,gssapi-with-mic,password
debug1: Next authentication method: publickey
debug1: Trying private key: C:\\Documents and Settings\\.ssh\\id_cmf_mediatech
debug1: read PEM private key done: type RSA
debug1: Authentication succeeded (publickey).
debug1: channel 0: new [client-session]
debug1: Entering interactive session.
debug1: Sending subsystem: sftp
Request for subsystem 'sftp' failed on channel 0
Unable to stablish SFTP connection: Connection to remote server is broken at C:\
PROGRA~1\OpenSSH\usr\sbin\test.pl line 23.