remote end (bank) is tight-lipped about their setup. Here's what "version" reports from SFTP prompt:

remote: sftp> version
SFTP protocol version 3
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there is no error reported; I run the script from command line (more => '-v'), files appear to transfer ok.

Here's my setup:

CentOS release 6.4 (Final)
This is perl, v5.10.1 (*) built for x86_64-linux-thread-multi
OpenSSH_5.3p1, OpenSSL 1.0.0-fips 29 Mar 2010


Module id = Net::SFTP::Foreign
    CPAN_USERID  SALVA (Salvador Fandino Garcia <salva@cpan.org>)
    CPAN_VERSION 1.75
    CPAN_FILE    S/SA/SALVA/Net-SFTP-Foreign-1.75.tar.gz
    MANPAGE      Net::SFTP::Foreign - SSH File Transfer Protocol clien
+t
    INST_FILE    /usr/local/share/perl5/Net/SFTP/Foreign.pm
    INST_VERSION 1.73
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Here's the result of a dry-run (no files) using debug:

#26678 1366047604.00000 new: This is Net::SFTP::Foreign 1.73
#26678 1366047604.00000 new: Loaded from /usr/local/share/perl5/Net/SF
+TP/Foreign.pm
#26678 1366047604.00000 new: Running on Perl v5.10.1 for linux
#26678 1366047604.00000 new: debug set to 18446744073709548519
#26678 1366047604.00000 new: ~0 is 18446744073709551615
#26678 1366047604.00000 new: Using backend Net::SFTP::Foreign::Backend
+::Unix 1.73
#26678 1366047604.00000 _init_transport: ssh cmd: ssh -i /data/home/dp
+sppay/.ssh/id_rsa -o PreferredAuthentications=publickey -l ftse3423 -
+v fts4.mfts.jpmchase.com -s sftp

#26678 1366047604.00000 _queue_msg: queueing msg len: 5, code:1, id:3 
+... [1]
#26678 1366047604.00000 _get_msg: waiting for message... [1]
#26678 1366047604.00000 _do_io: _do_io connected: 1
#26678 1366047604.00000 _do_io: _do_io select(-,-,-, undef)
#26678 1366047604.00000 _do_io: _do_io write queue: 9, syswrite: 9, ma
+x: 65536, $!:
#26678 1366047604.00000 _do_io: _do_io select(-,-,-, undef)
OpenSSH_5.3p1, OpenSSL 1.0.0-fips 29 Mar 2010
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: Applying options for *
debug1: Connecting to foo.com [x.x.x.x] port 22.
debug1: Connection established.
debug1: identity file /data/home/dpsppay/.ssh/id_rsa type 1
debug1: Remote protocol version 2.0, remote software version SSHD
debug1: no match: SSHD
debug1: Enabling compatibility mode for protocol 2.0
debug1: Local version string SSH-2.0-OpenSSH_5.3
debug1: SSH2_MSG_KEXINIT sent
debug1: SSH2_MSG_KEXINIT received
debug1: kex: server->client arcfour256 hmac-md5 none
debug1: kex: client->server aes128-cbc hmac-md5 none
debug1: SSH2_MSG_KEX_DH_GEX_REQUEST(1024<4096<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 'foo.com' is known and matches the RSA host key.
debug1: Found key in /data/home/dpsppay/.ssh/known_hosts:3
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: password,publickey,keyboard
+-interactive
debug1: Next authentication method: publickey
debug1: Offering public key: /data/home/dpsppay/.ssh/id_rsa
debug1: Server accepts key: pkalg ssh-rsa blen 277
debug1: read PEM private key done: type RSA
debug1: Authentication succeeded (publickey).
debug1: channel 0: new [client-session]
debug1: Entering interactive session.
debug1: Sending environment.
debug1: Sending env LANG = en_US.UTF-8
debug1: Sending subsystem: sftp
#26678 1366047614.00000 _do_io: _do_io read sysread: 9, total read: 9,
+ $!:
#26678 1366047614.00000 _get_msg: got it!, len:5, code:2, id:-, status
+: -
#26678 1366047614.00000 DESTROY: Net::SFTP::Foreign=HASH(0x1faa380)->D
+ESTROY called (current pid: 26678, disconnect_by_pid: )
#26678 1366047614.00000 disconnect: Net::SFTP::Foreign=HASH(0x1faa380)
+->disconnect called (ssh pid: 26679)
#26678 1366047614.00000 _conn_lost: _conn_lost
#26678 1366047614.00000 _set_status: _set_status code: 7, str: Connect
+ion lost
#26678 1366047614.00000 _set_error: _set_err code: 37, str: Connection
+ to remote server is broken
debug1: client_input_channel_req: channel 0 rtype exit-status reply 0
debug1: channel 0: free: client-session, nchannels 1
debug1: fd 0 clearing O_NONBLOCK
debug1: fd 1 clearing O_NONBLOCK
Transferred: sent 2288, received 1840 bytes, in 0.4 seconds
Bytes per second: sent 5432.6, received 4368.8
debug1: Exit status 0
0-bash-4.1$
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