Use lftp with key/passphrase combination

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http://superuser.com – i have been wrecking my head around this for hours but so far have been unsuccessful: one a mac, i can do the following: connect to my server via ssh enter private-key passphrase passphrase is stored in keychain lftp now automatically uses the stored passphrase on windows, cygwin does not store the passphrase, and lftp does not prompt me for it. so when i enter lftp -p PORT -e "set ssl:key-file file" -u user,xxx sftp://IP and do 'ls', i immediately get disconnected. any idea how i can pass along the passphrase/make lftp ask me for it? thanks :) (this might work with putty, but i want (HowTos)