无法从Debian主机转到VirtualBox CentOS 7来宾

Question

我有一个Debian 9主机。我可以直接进入我的Raspberry Pi和其他没有问题的服务器。我已经将openSUSE作为虚拟机安装在VirtualBox中。我没问题就能直接进入虚拟机。为了在VirtualBox中设置它，我转到:设置>网络>高级>端口转发>名称: ssh，协议: TCP，主机IP：(空白)，主机端口：(随机高端口号)，来宾IP：(空白)，来宾端口: 22。这是为适配器1，它是“附加到:NAT。”这些指示是在几个不同的论坛帖子。我对我的CentOS虚拟机做了同样的事情，但是使用了不同的主机端口(随机高端口号)。我已经确保sshd服务与sudo systemctl status sshd一起运行。但是，我无法将ssh放到CentOS虚拟机中。我收到以下错误(最后一行)：

~$ ssh -p 1820 CentosUser@127.0.0.1 -v
OpenSSH_7.4p1 Debian-10, OpenSSL 1.0.2k  26 Jan 2017
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: /etc/ssh/ssh_config line 19: Applying options for *
debug1: Connecting to 127.0.0.1 [127.0.0.1] port 1820.
debug1: Connection established.
debug1: key_load_public: No such file or directory
debug1: identity file /home/brock/.ssh/id_rsa type -1
debug1: key_load_public: No such file or directory
debug1: identity file /home/brock/.ssh/id_rsa-cert type -1
debug1: key_load_public: No such file or directory
debug1: identity file /home/brock/.ssh/id_dsa type -1
debug1: key_load_public: No such file or directory
debug1: identity file /home/brock/.ssh/id_dsa-cert type -1
debug1: key_load_public: No such file or directory
debug1: identity file /home/brock/.ssh/id_ecdsa type -1
debug1: key_load_public: No such file or directory
debug1: identity file /home/brock/.ssh/id_ecdsa-cert type -1
debug1: key_load_public: No such file or directory
debug1: identity file /home/brock/.ssh/id_ed25519 type -1
debug1: key_load_public: No such file or directory
debug1: identity file /home/brock/.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
ssh_exchange_identification: read: Connection reset by peer

这个问题与如何为其网络或ssh配置CentOS有关。CentOS VM没有连接到互联网的问题。这似乎对VirtualBox用户来说是一个简单的测试。CentOS极小等为680 MB。

以下是我尝试使用我的用户和根用户进行ssh时的/var/log/secure输出。

May 31 00:58:03 localhost sshd[1141]: Server listening on 0.0.0.0 port 22.
May 31 00:58:03 localhost sshd[1141]: Server listening on :: port 22.
May 31 00:58:14 localhost login: pam_unix(login:session): session opened for user root by LOGIN(uid=0)
May 31 00:58:14 localhost login: ROOT LOGIN ON tty1
May 31 00:58:22 localhost polkitd[656]: Registered Authentication Agent for unix-process:2529:3738 (system bus name :1.30 [/usr/bin/pkttyagent --notify-fd 5 --fallback], object path /org/freedesktop/PolicyKit1/AuthenticationAgent, locale en_US.UTF-8)
May 31 00:58:23 localhost login: pam_unix(login:session): session closed for user root
May 31 00:58:23 localhost polkitd[656]: Unregistered Authentication Agent for unix-process:2529:3738 (system bus name :1.30, object path /org/freedesktop/PolicyKit1/AuthenticationAgent, locale en_US.UTF-8) (disconnected from bus)
May 31 00:58:25 localhost gdm-launch-environment]: pam_unix(gdm-launch-environment:session): session opened for user gdm by (uid=0)
May 31 00:58:27 localhost polkitd[656]: Registered Authentication Agent for unix-session:c1 (system bus name :1.55 [gnome-shell --mode=gdm], object path /org/freedesktop/PolicyKit1/AuthenticationAgent, locale en_US.UTF-8)
May 31 00:58:39 localhost gdm-password]: pam_unix(gdm-password:session): session opened for user jbc by (unknown)(uid=0)
May 31 00:58:40 localhost gdm-launch-environment]: pam_unix(gdm-launch-environment:session): session closed for user gdm
May 31 00:58:40 localhost polkitd[656]: Unregistered Authentication Agent for unix-session:c1 (system bus name :1.55, object path /org/freedesktop/PolicyKit1/AuthenticationAgent, locale en_US.UTF-8) (disconnected from bus)
May 31 00:58:40 localhost polkitd[656]: Registered Authentication Agent for unix-session:2 (system bus name :1.69 [/usr/libexec/xfce-polkit], object path /org/freedesktop/PolicyKit1/AuthenticationAgent, locale en_US.UTF-8)
May 31 00:59:30 localhost sudo:     jbc : user NOT in sudoers ; TTY=pts/0 ; PWD=/home/jbc ; USER=root ; COMMAND=/bin/yum remove --purge chromium
May 31 00:59:42 localhost su: pam_unix(su-l:session): session opened for user root by jbc(uid=1000)
May 31 01:15:18 localhost polkitd[656]: Registered Authentication Agent for unix-process:4582:105315 (system bus name :1.86 [/usr/bin/pkttyagent --notify-fd 5 --fallback], object path /org/freedesktop/PolicyKit1/AuthenticationAgent, locale en_US.UTF-8)
May 31 12:58:19 localhost polkitd[659]: Loading rules from directory /etc/polkit-1/rules.d
May 31 12:58:19 localhost polkitd[659]: Loading rules from directory /usr/share/polkit-1/rules.d
May 31 12:58:19 localhost polkitd[659]: Finished loading, compiling and executing 4 rules
May 31 12:58:19 localhost polkitd[659]: Acquired the name org.freedesktop.PolicyKit1 on the system bus
May 31 12:58:29 localhost sshd[1139]: Server listening on 0.0.0.0 port 22.
May 31 12:58:29 localhost sshd[1139]: Server listening on :: port 22.
May 31 12:58:52 localhost login: pam_unix(login:session): session opened for user jbc by LOGIN(uid=0)
May 31 12:58:52 localhost login: LOGIN ON tty1 BY jbc
May 31 13:02:01 localhost polkitd[659]: Registered Authentication Agent for unix-process:2581:22909 (system bus name :1.34 [/usr/bin/pkttyagent --notify-fd 5 --fallback], object path /org/freedesktop/PolicyKit1/AuthenticationAgent, locale en_US.UTF-8)
May 31 13:02:04 localhost polkitd[659]: Operator of unix-process:2581:22909 successfully authenticated as unix-user:root to gain TEMPORARY authorization for action org.freedesktop.systemd1.manage-units for system-bus-name::1.35 [init 5] (owned by unix-user:jbc)
May 31 13:02:05 localhost polkitd[659]: Unregistered Authentication Agent for unix-process:2581:22909 (system bus name :1.34, object path /org/freedesktop/PolicyKit1/AuthenticationAgent, locale en_US.UTF-8) (disconnected from bus)
May 31 13:02:05 localhost login: pam_unix(login:session): session closed for user jbc
May 31 13:02:06 localhost gdm-launch-environment]: pam_unix(gdm-launch-environment:session): session opened for user gdm by (uid=0)
May 31 13:02:09 localhost polkitd[659]: Registered Authentication Agent for unix-session:c1 (system bus name :1.64 [gnome-shell --mode=gdm], object path /org/freedesktop/PolicyKit1/AuthenticationAgent, locale en_US.UTF-8)
May 31 13:02:15 localhost gdm-password]: pam_unix(gdm-password:session): session opened for user jbc by (unknown)(uid=0)
May 31 13:02:16 localhost gdm-launch-environment]: pam_unix(gdm-launch-environment:session): session closed for user gdm
May 31 13:02:16 localhost polkitd[659]: Unregistered Authentication Agent for unix-session:c1 (system bus name :1.64, object path /org/freedesktop/PolicyKit1/AuthenticationAgent, locale en_US.UTF-8) (disconnected from bus)
May 31 13:02:17 localhost polkitd[659]: Registered Authentication Agent for unix-session:4 (system bus name :1.78 [/usr/libexec/xfce-polkit], object path /org/freedesktop/PolicyKit1/AuthenticationAgent, locale en_US.UTF-8)
May 31 13:02:33 localhost su: pam_unix(su-l:session): session opened for user root by jbc(uid=1000)
May 31 13:03:18 localhost polkitd[659]: Registered Authentication Agent for unix-process:4348:30623 (system bus name :1.87 [/usr/bin/pkttyagent --notify-fd 5 --fallback], object path /org/freedesktop/PolicyKit1/AuthenticationAgent, locale en_US.UTF-8)
May 31 13:03:18 localhost polkitd[659]: Unregistered Authentication Agent for unix-process:4348:30623 (system bus name :1.87, object path /org/freedesktop/PolicyKit1/AuthenticationAgent, locale en_US.UTF-8) (disconnected from bus)

此外，/var/log/secure ssh相关：

[root@localhost ~]# cat /var/log/secure | grep "May 31" | grep ssh
May 31 00:58:03 localhost sshd[1141]: Server listening on 0.0.0.0 port 22.
May 31 00:58:03 localhost sshd[1141]: Server listening on :: port 22.
May 31 12:58:29 localhost sshd[1139]: Server listening on 0.0.0.0 port 22.
May 31 12:58:29 localhost sshd[1139]: Server listening on :: port 22.

Answer 1

你说过：

具有不同的主机端口(随机高端口号)。

但是你的日志显示：

服务器监听0.0.0.0端口22。

当您尝试登录到CentOS框时，您将得到以下响应：

OpenSSH_7.4p1 Debian-10，OpenSSL 1.0.2k 2017年1月26日

那是你的Ubuntu盒子接电话。

如果包含了/etc/ssh/sshd_config，就更明显了。“端口”设置必须与您配置的用于转发的高端口相匹配。

Answer 2

看起来密钥身份验证失败了(您已经设置它了吗？)，并且/etc/ssh/sshd_config可能遗漏了行：

PasswordAuthentication yes

可能包括来自CentOS VM的/etc/ssh/sshd_config文件以获得更多信息。