I can confirm that your script works fine---no errors, but it's on Linux. To follow up on what salva recommended, syphilis wrote a ppm for Net::SSH2 back in November of 2006. You'll find it here

In reply to Re: Module Net::OpenSSH error child exited with code 255 by Khen1950fx
in thread Module Net::OpenSSH error child exited with code 255 by steelcarn99

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