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SSH：远程主机关闭连接

tag-icon • tag-icon macos ssh sshd ssh-keys
SSH：远程主机关闭连接

设置如下，我有四台机器：

  • A：一个 Ubuntu 盒子，充当 ssh 客户端；
  • 乙：一台运行 El Capitan（OS X 10.11）的 iMac，我想要连接的 ssh 服务器；
  • C：另一台运行 Mavericks（OS X 10.9）的 iMac；
  • 德：Synology NAS（DSM 5.2）；

从A我可以连接到C和德。 从C和德我可以连接到乙。但当我尝试连接到乙从A我收到以下消息：

在A（-vvv可选）：

OpenSSH_6.6.1, OpenSSL 1.0.1f 6 Jan 2014
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: /etc/ssh/ssh_config line 19: Applying options for *
debug2: ssh_connect: needpriv 0
debug1: Connecting to 2a01:********* [2a01:*********] port22.
debug1: Connection established.
debug3: Incorrect RSA1 identifier
debug3: Could not load "/home/<user>/.ssh/id_rsa" as a RSA1 public key
debug1: identity file /home/<user>/.ssh/id_rsa type 1
debug1: identity file /home/<user>/.ssh/id_rsa-cert type -1
debug1: identity file /home/<user>/.ssh/id_dsa type -1
debug1: identity file /home/<user>/.ssh/id_dsa-cert type -1
debug1: identity file /home/<user>/.ssh/id_ecdsa type -1
debug1: identity file /home/<user>/.ssh/id_ecdsa-cert type -1
debug1: identity file /home/<user>/.ssh/id_ed25519 type -1
ebug1: identity file /home/<user>/.ssh/id_ed25519-cert type -1
debug1: Enabling compatibility mode for protocol 2.0
debug1: Local version string SSH-2.0-OpenSSH_6.6.1p1 Ubuntu-2ubuntu2.6
ssh_exchange_identification: Connection closed by remote host

在乙：

sshd[7215]: error: BSM audit: getaddrinfo failed for UNKNOWN: nodename nor servname provided, or not known
sshd[7215]: Could not write ident string to UNKNOWN
com.apple.xpc.launchd[1] (com.openssh.sshd.1681EC73-750F-45A5-998D-B54A0BBE893E[7215]): Service exited with abnormal code: 255

到底是怎么回事？

答案1

看起来是防火墙问题。为了通过 ssh 连接，您必须允许launchd（而不是sshd）接受传入连接。

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