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  • Offending ECDSA key in /var/lib/sss/pubconf/known_hosts

    Posted on

    I'm getting the dreaded "Offending ECDSA key in /var/lib/sss/pubconf/known_hosts" message when I ssh to a particular host:

    @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
    @    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 a host key has just been changed.
    The fingerprint for the ECDSA key sent by the remote host is
    5a:b5:f5:9b:93:d9:7b:58:06:a4:50:83:aa:bf:a8:96.
    Please contact your system administrator.
    Add correct host key in /root/.ssh/known_hosts to get rid of this message.
    Offending ECDSA key in /var/lib/sss/pubconf/known_hosts:4
    ECDSA host key for ulrhnsat01 has changed and you have requested strict checking.
    Host key verification failed.
    

    This host was just rebuilt from scratch. I have deleted its host entry from IPA. I have stopped sssd, deleted ALL the entries from

    /var/lib/sss/pubconf/known_hosts
    , and restarted sssd, but the problem persists and
    /var/lib/sss/pubconf/known_hosts
    gets rewritten to its original value.

    How do I fix the problem?

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