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#Ubuntu 更改ssh默认连接端口

 3 years ago
source link: https://xmanyou.com/ubuntu-change-ssh-port/
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neoserver,ios ssh client
8 March 2021 / Ubuntu

#Ubuntu 更改ssh默认连接端口

ssh默认的连接端口是22

但是，为了安全起见，一般会改成其他端口，具体步骤如下

  • 0). 开启云服务器的对应端口
    如果是阿里云之类的云服务器，需要先从云服务器后台打开对应的端口。

  • 1). 修改/etc/ssh/sshd_config
    查看当前ssh的端口

grep -i port /etc/ssh/sshd_config

#Port 22
#GatewayPorts no

表示当前端口是22

使用sudo修改#Port这行，将22改成想要的端口，比如6666

sudo vi /etc/ssh/sshd_config
...
Port 6666
...
  • 2). 重启sshd服务
sudo systemctl restart sshd

查看是否生效

sudo netstat -tulpn | grep ssh
tcp        0      0 0.0.0.0:6666           0.0.0.0:*               LISTEN      18138/sshd
  • 3). 重新连接
ssh <server-ip> -p <新端口>

其他副作用

客户端连接时，如果发现以下错误：

@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
@    WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED!     @
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
IT IS POSSIBLE THAT SOMEONE IS DOING SOMETHING NASTY!
Someone could be eavesdropping on you right now (man-in-the-middle attack)!
It is also possible that a host key has just been changed.

ssh-known-host-key-changed

表示客户端之前已经连接过，需要修改 .ssh/known_hosts

删掉之前的host记录，然后重新连接即可。

阿斌

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