Since you are having trouble with Net::SSH::Perl, maybe you should try a simple login test with Net::SSH. It only uses keys for authorization, so it might work better.

#!/usr/bin/perl
#this uses Net::SSH, instead of Net::SSH::Perl 
#and it needs the key method of authentication, 
#it won't use passwords. 
use strict;
use warnings;
use Net::SSH qw(sshopen3);

my $user = "zz";
my $host = "zz@.z.net";
my $cmd = "uptime";
sshopen3( "$user\@$host", *WRITER, *READER, *ERROR, "$cmd" );
my $uptime = <READER>;
my $error = <ERROR>;
chomp $uptime;
print "$uptime\n";
print "$error\n";
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