A few months ago I set up (relying in part on helpful instructions at http://www.math.ohio-state.edu/%7Eccunning/osx-backup.html) a rudimentary backup scheme from my powerbook to an iMac: in the wee hours of the morning the powerbook would connect to the imac via ssh, using public key authentication, and would then use rsync to synchronize some key folders. This felt like quite an accomplishment, since I'm a bit of a unix idiot, but I've recently noticed that the ssh connection no longer works -- any attempt to ssh from the powerbook to the imac yields the following msg: WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED! @ @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ IT IS POSSIBLE THAT SOMEONE IS DOING SOMETHING NASTY! Someone could be eavesdropping on you right now (man-in-the-middle attack)! It is also possible that the RSA host key has just been changed. The fingerprint for the RSA key sent by the remote host is 5f:6a:9d:b6:63:b1:3b:5f:65:91:ee:62:44:e9:3d:d7. Please contact your system administrator. Add correct host key in /var/root/.ssh/known_hosts to get rid of this message. Offending key in /var/root/.ssh/known_hosts:1 RSA host key for 10.0.1.2 has changed and you have requested strict checking. Host key verification failed. Keeping in mind that my knowledge of unix (and the technical terms associated with it) is woefully inadequate, any suggestions about what I need to do to get the ssh and backup scheme up and running again? (I think I changed the admin password on the imac recently, so that may account for the problem, but I still don't know quite what to do to solve it.) Also, it seems like there just aren't many unix resources (books, websites, etc.) geared toward showing people who aren't unix gurus but are competent with computers how they can leverage the unix commands inn Mac OS X to accomplish useful things like backups. (Man pages tend to be pretty unhelpful in this respect.) Any thoughts on this score? Thanks! Andrew Moser Department of Philosophy University of the South