Hello Salva and others ... Can you please help me as I am getting error while trying to ssh to a HP-UX box from Linux Machine.I am getting below error .... 
[bmallik@null-001485a93da4 ~]$ perl -w RDF.pl

**********************************************************************
+*****
Qwest computers and the Qwest computer network are Qwest property.
Only authorized persons may use them and only for legal and proper pur
+poses
as determined solely by Qwest.  Users consent to the monitoring of the
+ir use.
Employees must use Qwest computers and the network in accordance with 
+the
Qwest Code of Conduct, subject to discipline for misuse. Customer use 
+is
governed by the Qwest Acceptable Use Policy.
----------------------------------------------------------------------
+----

NOTE: This server is NOT under IBM full support. Instead it is under a
Maintenance Plus contract and support is through a Qwest support group
+.

For UNIX system adminstration support and work requests for this syste
+m,
please refer to the instructions found on this URL:
        http://sm-unix.uswc.uswest.com
or contact the Help Desk at 1-877-828-4357 (see TheQ web page).
**********************************************************************
+*****

Couldn't establish SSH connection: unable to establish master SSH conn
+ection: control command failed: child exited with code 1 at RDF.pl li
+ne 14.
[bmallik@null-001485a93da4 ~]$

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SO This error comes just after it try to be connected ....I dont know wehre it gets stucked.I am not a perl expert.I am giving the code also as below ... 
#!/usr/bin/perl
use Net::OpenSSH;
#use Math::Pari;

my $host="hplwp638";
my $user="radarop";
my $password="XXXXX";

#$InHandle = $ssh->input_log("RDFinlog.txt");
#$OutHandle = $ssh->output_log("RDFoutlog.txt");


my $ssh= Net::OpenSSH->new($host,user=>$user, passwd=>$password);
$ssh->error and warn "Couldn't establish SSH connection: ". $ssh->erro
+r;
#print "Trying to connect to $host now\n";
#$ssh->waitfor(String => 'hplwp638#[/home/radarop]');
#print $ssh->cmd("who");
my @output = $ssh->capture("who");
print @output;

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Now I am getting below erroe after changing my code in a single line .... 
my $ssh= Net::OpenSSH->new($host,user=>$user, passwd=>$password, stric
+t_mode => 0, ctl_dir => "/tmp/~.libnet-openssh-perl" );

[download]
Error 
[bmallik@null-001485a93da4 ~]$ perl -w RDF.pl
Couldn't establish SSH connection: unable to establish master SSH conn
+ection: the authenticity of the target host can't be established, the
+ remote host public key is probably not present on the '~/.ssh/known_
+hosts' file at RDF.pl line 14.

[download]

In reply to Error in Login by useing Net::OpenSSH by bighnaraj

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