Why sshd outputs “error: Received disconnect from XXX port XXX: Server protocol violation: unexpected SSH2_MSG_UNIMPLEMENTED packet [preauth])” message?

Solution Unverified - Updated -

Issue

  • ssh server outputs sshd[XXX]: error: Received disconnect from XXX port XXX: Server protocol violation: unexpected SSH2_MSG_UNIMPLEMENTED packet [preauth]) message.

Environment

  • Red Hat Enterprise Linux 7, 8

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