#!/usr/bin/perl -w

use strict;

use Net::SSH::Perl;

my @logins = (
[undef,undef],
["myname","mypass"],
["local","localpw"],
["root",undef],
["root","pass1"],
["root","pass2"],
...
["root","passn]
);

my $ssh;

<open file with server list>

while (my $server = <read from file>) {
   chomp $server;
   print $server;
   if (SSHConnect($server)) {
      <do some work>
   }
}

sub SSHConnect {
   my $server = shift;
   my $return = 0;
   $ssh = Net::SSH::Perl->new($server,protocol=>'2,1');
   foreach (@logins) {
       my ($u,$p) = @{$_};
       eval {
          $ssh->login();
       };
       if (!$@) {
           $return = 1;
           last;
       };
   return $return;
}