Hi I am using SFTP to connect to a server using private-public key authentication . However I am not able to connect. I am able to connect using bash command

here is the code

Net::SFTP::Foreign->new($ftp_server, port => $ftp_port , user => $ftp_
+username, password => $ftp_password , key_path => $private_key , more
+ => [ '-v', -o => 'PreferredAuthentications publickey']);


here is verbose log 

debug1: Reading configuration data /home/fds/apfh/.ssh/config

debug1: Reading configuration data /etc/ssh/ssh_config

debug1: Applying options for *

debug1: Connecting to 121.241.2.65 [121.241.2.65] port 6010.

debug1: Connection established.

debug1: identity file /home/fds/apfh/FDSnse_fh/etc/id_rsa type 1

debug1: identity file /home/fds/apfh/FDSnse_fh/etc/id_rsa-cert type -1

debug1: Remote protocol version 2.0, remote software version OpenSSH_5
+.3

debug1: match: OpenSSH_5.3 pat OpenSSH*

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 aes128-ctr hmac-md5 none

debug1: kex: client->server aes128-ctr 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 '[121.241.2.65]:6010' is known and matches the RSA host k
+ey.

debug1: Found key in /home/fds/apfh/.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

                                   "NOTICE TO USERS"


            "The system is to be used for AUTHORIZED business purpose 
+only.
        All activities on this system are being monitored. Unauthorize
+d access
             to this system may be subject to legal action,and/or pros
+ecution"

debug1: Authentications that can continue: publickey

debug1: Next authentication method: publickey

debug1: Offering public key: /home/fds/apfh/FDSnse_fh/etc/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: Requesting no-more-sessions@openssh.com

debug1: Entering interactive session.

debug1: Sending environment.

debug1: Sending subsystem: sftp

debug1: channel 0: free: client-session, nchannels 1

debug1: fd 0 clearing O_NONBLOCK

debug1: fd 1 clearing O_NONBLOCK

debug1: fd 2 clearing O_NONBLOCK

Connection to 121.241.2.65 closed by remote host.

Transferred: sent 2392, received 2488 bytes, in 30.4 seconds

Bytes per second: sent 78.7, received 81.8

debug1: Exit status -1

ERROR[06/21 13:41:52] fetch_symbology.pl.new:736 Cannot connect to [SF
+TP] server, error message: SSH slave exited unexpectedly with error c
+ode 255 WARN [06/21 13:41:52] fetch_symbology.pl.new:303 [SFTP] conne
+ction attempt to server[121.241.2.65] failed, will retry in 60 second
+s!
[download]

Any help will be appreciated .