For some reason the ssh client doesn't like the StrictHostKeyChecking option.

Which one are you using?

What do you get when you run ssh -V at the terminal. In case you don't have terminal access, add the following line to your script: 

system "ssh -V 1>&2";

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In reply to Re^3: Net-SFTP-Foreign: SSH slave exited unexpectedly with error code 255 by salva
in thread Net-SFTP-Foreign: SSH slave exited unexpectedly with error code 255 by toohoo

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