This isn't answer but an educated guess. Without your code, it's hard to tell what's going on. I'm not entirely sure that your problem is with Net::SSH::Perl. As I see it, it could be a system problem with configuration. Have you checked /etc/ssh_config and /etc/fstab? On the other hand, if it is a problem with Net::SSH::Perl, I'd be willing to guess that it has something to do with the MAX_PACKET_SIZE. If the rmax is over or short, it could cause the problem. I'd use Net::SSH::Perl::Constants because you must explicitly request a constant. Here's an simple example:

#!/usr/bin/perl

use strict;
use warnings;
use Net::SSH::Perl;
use Net::SSH::Perl::Constants qw(MAX_PACKET_SIZE);

my $host = 'host';
my $user = 'user';
my $pass = 'pass';
my $cmd  = 'perldocs Net::SSH::Perl::Constants';

my $ssh = Net::SSH::Perl->new(
          $host, 
          debug => 1,
          protocol => 2
);
$ssh->login($user, $pass);

my($stdout, $stderr, $exit) = $ssh->cmd($cmd);
print $stdout, "\n";
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