my $sshSession = Net::SSH::Perl->new($address, debug => 'true', protocol => '2,1');
# Login works fine            
$sshSession->login('xxxxxx','xxxxx') || die "Ssh login       Didn't work";

my $command = "ps aux";

# Execute a command                       
my  ($out, $err, $exit) = $sshSession->cmd($command);
# hangs while executing ...