system is not reachable through ssh while performing an upgrade from RHEL8.0 to RHEL8.1: "Bad configuration option: CASignatureAlgorithms"

Solution Verified - Updated -


  • While a system upgrade is performed from RHEL8.0 to RHEL8.1, users cannot login using ssh
  • During the upgrade, the system journal shows sshd.service not starting properly with the following messages

    systemd[1]: Starting OpenSSH server daemon...
    sshd[XXX]: command-line: line 0: Bad configuration option: CASignatureAlgorithms
    systemd[1]: sshd.service: Main process exited, code=exited, status=1/FAILURE
    systemd[1]: sshd.service: Failed with result 'exit-code'.
    systemd[1]: Failed to start OpenSSH server daemon.


  • Red Hat Enterprise Linux 8
    • openssh
    • crypto-policies

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