問題：要塞ホストIPの不一致~/.ssh/known_hosts

MacでリモートサーバーへのパスワードなしのSSH接続を作成しました。動作しました(!)。その後、端末を閉じて再度開いて再試行したところ、次の結果が得られました（ユーザー名、my_ipは実際ではありません）。

ssh -vvv username@my_ip
OpenSSH_7.2p2, LibreSSL 2.4.1
debug1: Reading configuration data /Users/Me/.ssh/config
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: /etc/ssh/ssh_config line 20: Applying options for *
debug1: /etc/ssh/ssh_config line 53: Applying options for *
debug2: resolving "my_ip" port 22
debug2: ssh_connect_direct: needpriv 0
debug1: Connecting to my_ip [my_ip] port 22.
debug1: Connection established.
debug1: identity file /Users/Me/.ssh/id_rsa type 1
debug1: key_load_public: No such file or directory
debug1: identity file /Users/Me/.ssh/id_rsa-cert type -1
debug1: key_load_public: No such file or directory
debug1: identity file /Users/Me/.ssh/id_dsa type -1
debug1: key_load_public: No such file or directory
debug1: identity file /Users/Mes/.ssh/id_dsa-cert type -1
debug1: key_load_public: No such file or directory
debug1: identity file /Users/Me/.ssh/id_ecdsa type -1
debug1: key_load_public: No such file or directory
debug1: identity file /Users/Me/.ssh/id_ecdsa-cert type -1
debug1: key_load_public: No such file or directory
debug1: identity file /Users/Me/.ssh/id_ed25519 type -1
debug1: key_load_public: No such file or directory
debug1: identity file /Users/Me/.ssh/id_ed25519-cert type -1
debug1: Enabling compatibility mode for protocol 2.0
debug1: Local version string SSH-2.0-OpenSSH_7.2
ssh_exchange_identification: read: Connection reset by peer

.sshフォルダを確認してみるとid_rsaそこにありますが、他にはありません。エラーを見ると、どういうわけかこのファイルを生成する必要があるようですが、どうすればよいかわかりません。

どんな助けでも大変感謝します。