我的笔记本电脑 (10.197.1.xx) 和台式机 (10.141.200.xxx) 上运行着 ubuntu 16.04 (mate)。从其中任何一个我都可以 ping 另一个。但是 ssh 去暂停（它不会拒绝连接，或给出任何警告或错误消息）。
OpenSSH_7.2p2 Ubuntu-4ubuntu2.1, OpenSSL 1.0.2g 1 Mar 2016
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: /etc/ssh/ssh_config line 19: Applying options for *
debug1: Connecting to 10.197.1.xxx [10.197.1.xxx] port 22.
debug1: connect to address 10.197.1.xxx port 22: Connection timed out
ssh: connect to host 10.197.1.xxx port 22: Connection timed out
有问题的 PC 和笔记本电脑都具有openssh 服务器安装。
$ sudo service sshd status
● ssh.service - OpenBSD Secure Shell server
Loaded: loaded (/lib/systemd/system/ssh.service; enabled; vendor preset: enab
Active: active (running) since Mon 2017-04-10 09:59:50 IST; 4h 49min ago
Process: 3682 ExecReload=/bin/kill -HUP $MAINPID (code=exited, status=0/SUCCES
Main PID: 1096 (sshd)
CGroup: /system.slice/ssh.service
└─1096 /usr/sbin/sshd -D
Apr 10 10:37:18 H110M-DS2 systemd[1]: Reloading OpenBSD Secure Shell serve
Apr 10 10:37:18 H110M-DS2 sshd[1096]: Received SIGHUP; restarting.
Apr 10 10:37:18 H110M-DS2 systemd[1]: Reloaded OpenBSD Secure Shell server
Apr 10 10:37:18 H110M-DS2 sshd[1096]: Server listening on 0.0.0.0 port 22.
Apr 10 10:37:18 H110M-DS2 sshd[1096]: Server listening on :: port 22.
Apr 10 10:37:18 H110M-DS2 systemd[1]: Reloading OpenBSD Secure Shell serve
Apr 10 10:37:18 H110M-DS2 sshd[1096]: Received SIGHUP; restarting.
Apr 10 10:37:18 H110M-DS2 systemd[1]: Reloaded OpenBSD Secure Shell server
Apr 10 10:37:18 H110M-DS2 sshd[1096]: Server listening on 0.0.0.0 port 22.
Apr 10 10:37:18 H110M-DS2 sshd[1096]: Server listening on :: port 22.
防火墙状态为不活跃的
sudo ufw status
Status: inactive
可能出什么问题了？我如何让 ssh 工作。
更新
该traceroute程序产生以下输出
traceroute to 10.197.1.xxx (10.197.1.xxx), 30 hops max, 60 byte packets
1 router.xxx.xxxx.xx.in (10.xxx.xxx.1) 1.069 ms 1.388 ms 1.691 ms
2 10.xxx.xxx.1 (10.xxx.xxx.1) 0.820 ms 0.814 ms 0.974 ms
3 172.xx.x.1 (172.xx.x.1) 0.371 ms 0.384 ms 0.375 ms
4 * * *
5 * * *
6 * * *
7 * * *
8 * * *
9 * * *
10 * * *
11 * * *
12 * * *
13 * * *
14 * * *
15 * * *
16 * * *
17 * * *
18 * * *
19 * * *
20 * * *
21 * * *
22 * * *
23 * * *
24 * * *
25 * * *
26 * * *
27 * * *
28 * * *
29 * * *
30 * * *
答案1
sudo apt-get update
sudo apt-get install ssh
sudo ufw allow 22
这是最低限度。它允许在已知端口上无限制地尝试失败的密码。直接 root 登录已禁用（登录后您仍然可以 su 和 sudo）。如果您的用户名和密码是可猜测的，并且互联网可以看到服务器，那么最终就会有人闯入。
默认情况下，root 用户不允许从 ubuntu 外部进行 ssh。你可以改为
sudo sed -ir 's/^(PermitRootLogin) .+/\1 yes/' /etc/ssh/sshd_config
sudo /etc/init.d/ssh restart
如果您仍然遇到问题，请尝试一下，telnet machineip 22它会显示您可以从其他计算机访问 22 端口。尝试按照此使 ssh 安全关联