Add master_stderr_discard => 1 to the constructor call: 
my $ssh = Net::OpenSSH->new($remote_host,
                            ssh_cmd => '/usr/local/bin/ssh',
                            user => $user,
                            password => $pass,
                            master_stderr_discard => 1);

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In reply to Re: Handling STDERR when using Net::OpenSSH by salva
in thread Handling STDERR when using Net::OpenSSH by sittingbull

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