It hangs because you haven't told it to do anything
Not really. If you don't tell it to to anything, it will not do anything, but it will not hang either. It will just silently drop the connection when the script exits. 
$ time perl -MNet::SSH::Perl -E '$ssh=Net::SSH::Perl->new(localhost, d
+ebug => 1); say "connected!"'
topo: Reading configuration data /home/salva/.ssh/config
topo: Reading configuration data /etc/ssh_config
topo: Connecting to localhost, port 22.
topo: Remote protocol version 2.0, remote software version OpenSSH_5.8
+p1 Debian-4ubuntu1
topo: Net::SSH::Perl Version 1.34, protocol version 2.0.
.opo: No compat match: OpenSSH_5.8p1 Debian-4ubuntu1
topo: Connection established.
connected!

real    0m0.263s
user    0m0.200s
sys    0m0.010s

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In reply to Re^2: Net::SSH::Perl hanging on creating object by salva
in thread Net::SSH::Perl hanging on creating object by gepebril69

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