Linux CentOS remote SSH default 22 port modified to a different port

To modify the default port for SSH:

1, the file that controls 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 that precedes it:

#Port //Remove the Note #

#AddressFamily any

#ListenAddress 0.0.0.0

#ListenAddress::

3, add the same row below this line and change the port number to the one you want to modify:

Port 22

Port 2022 //Add a row to add the modified port number

#AddressFamily any

#ListenAddress 0.0.0.0

#ListenAddress::

4. After the change is saved, restart the SSH service:

#/etc/init.d/sshd Restart //or

#service sshd Restart

5, if you do not have access, you need to turn off the firewall:

#/etc/init.d/iptables Stop //or

#service iptables Stop

Or add one to the firewall filtering rule to allow access to the new port 2022:

#vi/etc/sysconfig/iptables

A new policy is put on 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, so that you can access the Linux host remotely via 2022.

Linux CentOS remote SSH default 22 port modified to a different port