ssh localhost 可以工作，但 ssh [localhost 的外部 url] 不工作

Question

我正在尝试弄清楚如何通过 ssh 连接到工作中的一台机器（它运行基于 RHEL 的发行版，带有 OpenSSH 5.3）。我收到了有关如何设置密钥、权限等的说明，这些说明在过去显然是有效的，我也严格遵循了这些说明，但无法让 ssh 正常工作（如果这不明显的话，我对 ssh 完全陌生）。

令我困惑的是，从机器本身来看，ssh localhost工作ssh 127.0.0.1正常，但ssh [url of machine]没有：-v给出输出

OpenSSH_5.3p1, OpenSSL 1.0.0-fips 29 Mar 2010
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: Applying options for *
debug1: Connecting to <url> [::1] port 22.
debug1: Connection established.
debug1: identity file /home/<username>/.ssh/identity type -1
debug1: identity file /home/<username>/.ssh/id_rsa type -1
debug1: identity file /home/<username>/.ssh/id_dsa type 2
ssh_exchange_identification: Connection closed by remote host

这与我尝试远程登录时得到的输出相同。我没有管理员权限，所以我认为我无法获取任何日志。

这是否会给任何人提供任何有关问题是什么的线索，或者是否有任何方法可以在没有 root 访问权限的情况下获得有关故障的更多详细信息？

编辑：我无法进入/etc/ssh/sshd_config，但/etc/ssh/ssh_config包含：

#   $OpenBSD: ssh_config,v 1.25 2009/02/17 01:28:32 djm Exp $

# This is the ssh client system-wide configuration file.  See
# ssh_config(5) for more information.  This file provides defaults for
# users, and the values can be changed in per-user configuration files
# or on the command line.

# Configuration data is parsed as follows:
#  1. command line options
#  2. user-specific file
#  3. system-wide file
# Any configuration value is only changed the first time it is set.
# Thus, host-specific definitions should be at the beginning of the
# configuration file, and defaults at the end.

# Site-wide defaults for some commonly used options.  For a comprehensive
# list of available options, their meanings and defaults, please see the
# ssh_config(5) man page.

# Host *
#   ForwardAgent no
#   ForwardX11 no
#   RhostsRSAAuthentication no
#   RSAAuthentication yes
#   PasswordAuthentication yes
#   HostbasedAuthentication no
#   GSSAPIAuthentication no
#   GSSAPIDelegateCredentials no
#   GSSAPIKeyExchange no
#   GSSAPITrustDNS no
#   BatchMode no
#   CheckHostIP yes
#   AddressFamily any
#   ConnectTimeout 0
#   StrictHostKeyChecking ask
#   IdentityFile ~/.ssh/identity
#   IdentityFile ~/.ssh/id_rsa
#   IdentityFile ~/.ssh/id_dsa
#   Port 22
#   Protocol 2,1
#   Cipher 3des
#   Ciphers aes128-ctr,aes192-ctr,aes256-ctr,arcfour256,arcfour128,aes128-cbc,3des-cbc
#   MACs hmac-md5,hmac-sha1,[email protected],hmac-ripemd160
#   EscapeChar ~
#   Tunnel no
#   TunnelDevice any:any
#   PermitLocalCommand no
#   VisualHostKey no
Host *
    GSSAPIAuthentication yes
# If this option is set to yes then remote X11 clients will have full access
# to the original X11 display. As virtually no X11 client supports the untrusted
# mode correctly we set this to yes.
    ForwardX11Trusted yes
# Send locale-related environment variables
    SendEnv LANG LC_CTYPE LC_NUMERIC LC_TIME LC_COLLATE LC_MONETARY LC_MESSAGES 
    SendEnv LC_PAPER LC_NAME LC_ADDRESS LC_TELEPHONE LC_MEASUREMENT 
    SendEnv LC_IDENTIFICATION LC_ALL LANGUAGE
    SendEnv XMODIFIERS

Answer 1

看一下/etc/ssh/sshd_config。（如果可以的话......）

配置中有一些内容定义 SSH 服务器的行为，例如接受连接和如​​何进行授权。