use Net::SSH::Perl; 
my $ssh;
$ssh = new Net::SSH::Perl("192.168.128.4"); $ssh->login("root"); 
($x,$y,$z) = $ssh->cmd('pwd');

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add: 
Use warning;
Use strict;

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Also, you may want to change: 
$ssh = new Net::SSH::Perl("192.168.128.4");

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To: 
$ssh = Net::SSH::Perl-> new("192.168.128.4");

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And, is this your entire code? Are all your permissions and passwords the same on each box you're testing?
The third box may require a passwd in the line: 
$ssh->login("root");

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following "root"


Es gibt mehr im Leben als Bücher, weißt du. Aber nicht viel mehr. - (Die Smiths)"

In reply to Re: SSH Permission Denied by sub_chick
in thread SSH Permission Denied by NolanPL

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