Centos remote SSH port 22 is changed to another port by default

Centos remote SSH port 22 is changed to another port by default

Modify the default SSH port:

1. The file controlling the SSH access port is/etc/ssh/sshd_config.

Therefore, edit the SSH configuration file sshd_config:

# Vi/etc/ssh/sshd_config

2. Find the Port = 22 field and remove the comment above it:

13# Port 22 // remove the annotator #

14 # AddressFamily any

15 # ListenAddress 0.0.0.0

16 # ListenAddress ::

3. Add the same line under this line and change the port number to the one you want to modify:

13 Port 22

14Port 2022 // Add a new row and add the modified Port number

15 # AddressFamily any

16 # ListenAddress 0.0.0.0

17 # ListenAddress ::

4. After saving the modification, restart the SSH service:

#/Etc/init. d/sshd restart // or

# Service sshd restart

5. If no access is available, disable the Firewall:

#/Etc/init. d/iptablesstop // or

# Service iptables stop

Alternatively, add a filter rule to allow access to the newly added port 2022:

# Vi/etc/sysconfig/iptables

Add a policy to allow port 2022:

: Input accept [0: 0]

: Forward accept [0: 0]

: Output accept [0: 0]

-A input-m state -- state ESTABLISHED, RELATED-j ACCEPT

-A input-p icmp-j ACCEPT

-A input-I lo-j ACCEPT

-A input-m state -- state NEW-m tcp-p tcp -- dport 22-j ACCEPT

-A input-m state -- state NEW-m tcp-p tcp -- dport 2022-j ACCEPT

-A input-j REJECT -- reject-with icmp-host-prohibited

-A forward-j REJECT -- reject-with icmp-host-prohibited

COMMIT

6. In this way, you can remotely access the linux host through 2022.