in reply to Issue with ssh to a cisco smart switch

Assuming the sg300 does user / password authentication and that's what you're using when you login directly - not public key correct? I don't believe I've enabled public key authentication in Net::SSH2::Cisco - looks like version 0.05 is needed :-)

Also, looks like you enabled Net::SSH2 debugging and the issue is happening before login. You may try 'dump_log' and provide a file name in the new() call, but that will only show data once you're logged in (which looks like you can't).

I had a bit of a different issue described here with fix

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Re^2: Issue with ssh to a cisco smart switch
by edimusrex (Monk) on Sep 13, 2017 at 14:12 UTC

    I'll give that a go and see what happens. I might also try this module on a RHEL server and see if I get the same error, beginning to wonder if it's OS specific. I am not using keystores to log in, just a simple ssh to the switch from the command line.