The module documentation contains a troubleshooting chapter. Follow it, specially point 3.
If after that, it still fails to connect, try this:
Enable the module debugging:
$Net::OpenSSH::debug = -1;
Enable verbosity on the ssh command adding the following option on the constructor call:
my $ssh= Net::OpenSSH->new(..., master_opts => '-vvv');
and then, post here the output you get.
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