Start the sftp session from the command line with the flag -v and look for differences (and also post it here!).

update: On the Net::SFTP::Foreign you are actually passing a password (even if it is the empty one). That makes the module force password authentication!

In reply to Re: passwordless SFTP works from cmd line, not from modules by salva
in thread passwordless SFTP works from cmd line, not from modules by mritty

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