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SFTP/SSH Client Sometimes Reports Host Key Changes When Connecting to Server

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in Linux

Applies to: 

Oracle Cloud Infrastructure - Version N/A and later

Linux OS - Version Oracle Linux 6.0 and later

Any platform.

 

Symptoms

  • An application or SFTP/SSH client reports random key changes when connecting to a SFTP/SSH server.
  • The SFTP/SSH server is actually two or more servers hosted behing a load-balancer. The application or SFTP/SSH client connects to the load-balancer
  • Checking the SSH server host keys inside /etc/ssh/ for each singe SFTP/SSH server shows that the host keys have not been modified.
  • There is no acceptable way to configure the application or SFTP/SSH clients to silently accept multiple host keys from the same server (and doing so is a serious security concern in any case).
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