ssh_exchange_identification：連接被遠端主機+ HP Procurve關閉

我試圖通過 ssh 從 linux 機器連接到我們的 HP Procurve 交換機，但我收到錯誤消息：“ssh_exchange_identification：連接已被遠端主機關閉。” （也作為根）

我可以毫無問題地通過 ssh 連接到其他 Linux 機器。通過 Windows + Putty 連接到 Switch 也可以。

它是一個標準的 Debian 安裝，沒有任何特定的配置。

我忘了什麼嗎？

   -vv 1.0.0.20
OpenSSH_7.4p1 Debian-10+deb9u3, OpenSSL 1.0.2l  25 May 2017
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: /etc/ssh/ssh_config line 19: Applying options for *
debug2: resolving "1.0.0.20" port 22
debug2: ssh_connect_direct: needpriv 0
debug1: Connecting to 1.0.0.20 [1.0.0.20] port 22.
debug1: Connection established.
debug1: permanently_set_uid: 0/0
debug1: key_load_public: No such file or directory
debug1: identity file /root/.ssh/id_rsa type -1
debug1: key_load_public: No such file or directory
debug1: identity file /root/.ssh/id_rsa-cert type -1
debug1: key_load_public: No such file or directory
debug1: identity file /root/.ssh/id_dsa type -1
debug1: key_load_public: No such file or directory
debug1: identity file /root/.ssh/id_dsa-cert type -1
debug1: key_load_public: No such file or directory
debug1: identity file /root/.ssh/id_ecdsa type -1
debug1: key_load_public: No such file or directory
debug1: identity file /root/.ssh/id_ecdsa-cert type -1
debug1: key_load_public: No such file or directory
debug1: identity file /root/.ssh/id_ed25519 type -1
debug1: key_load_public: No such file or directory
debug1: identity file /root/.ssh/id_ed25519-cert type -1
debug1: Enabling compatibility mode for protocol 2.0
debug1: Local version string SSH-2.0-OpenSSH_7.4p1 Debian-10+deb9u3
ssh_exchange_identification: Connection closed by remote host

ssh_exchange_identification: Connection closed by remote host

當 SSH 客戶端與伺服器建立 TCP 連接時，發生的第一個數據交換是伺服器將其版本字元串發送給客戶端。您收到的消息表明伺服器沒有將其版本字元串發送給客戶端，而是關閉了 TCP 連接。

這不是身份驗證失敗。伺服器尚未將其主機密鑰發送給客戶端，並且客戶端尚未嘗試向伺服器進行身份驗證。伺服器剛剛接受了來自客戶端的 TCP 連接，然後將其丟棄。

對此行為的最簡單解釋是伺服器配置為不接受僅來自特定 IP 地址的連接，並且您嘗試從不允許連接到伺服器的系統進行連接。

引用自：https://unix.stackexchange.com/questions/438042