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为什么我不能允许访问 Ubuntu 12.10 上的端口 22？

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为什么我不能允许访问 Ubuntu 12.10 上的端口 22？

我似乎无法弄清楚为什么端口 22 永远不允许我通过 SSH 访问我的笔记本电脑。以下是我尝试的方法：

ryan@gigantic-laptop:~$ sudo ufw status
Status: active

To                         Action      From
--                         ------      ----
22                         ALLOW       Anywhere
22                         ALLOW       Anywhere (v6)

22                         ALLOW OUT   Anywhere
22                         ALLOW OUT   Anywhere (v6)

ryan@gigantic-laptop:~$ ssh localhost
ssh: connect to host localhost port 22: Connection refused

或者如果我尝试禁用：

ryan@gigantic-laptop:~$ sudo ufw disable
Firewall stopped and disabled on system startup
ryan@gigantic-laptop:~$ sudo ufw status
Status: inactive
ryan@gigantic-laptop:~$ ssh localhost
ssh: connect to host localhost port 22: Connection refused
ryan@gigantic-laptop:~$ ssh 127.0.0.1
ssh: connect to host 127.0.0.1 port 22: Connection refused
ryan@gigantic-laptop:~$ sudo nmap 127.0.0.1

Starting Nmap 6.00 ( http://nmap.org ) at 2013-02-23 18:14 PST
Nmap scan report for localhost (127.0.0.1)
Host is up (0.000016s latency).
Not shown: 999 closed ports
PORT    STATE SERVICE
631/tcp open  ipp

Nmap done: 1 IP address (1 host up) scanned in 0.09 seconds

我究竟做错了什么？

答案1

我需要安装sudo apt-get install openssh-server。

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