The sniffer can catch the key exchange process. In order to do so, you have to make sure that the sniffer is present when the two devices exchange encryption keys, not just when the devices are re-connecting. You can upload the file in the original question, not in the comments.
SSH Tectia ConnectSecure is the newest addition to the SSH Tectia product family, which enables enterprises to implement high-performance secure file transfers, secure application connectivity and secure system administration throughout heterogeneous networks and is compatible with any commercial SSH or OpenSSH environment.
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