Modify the ssh remote connection port in CentOS6.0

Operating system: CentOS remote connection tool: SecureCRT lab task: CentOS6.0 modify the ssh remote connection port step: 1) add Port 9899 as follows: a) Method 1: [root @ www ~] # Vi/etc/sysconfig/iptables # add the following statement to the file;

Operating system: CentOS

Remote connection tool: SecureCRT

Tutorial task: modify the ssh remote connection port in CentOS 6.0

Tutorial steps:

1) add Port 9899 as follows:

A) Method 1:

[Root @ www ~] # Vi/etc/sysconfig/iptables # add the following statement to the file;

-A input-p tcp-m state -- state NEW-m tcp -- dport 9899-j ACCEPT

[Root @ www ~] #/Etc/init. d/iptables restart

B) Method 2:

[Root @ www ~] # Iptables-a input-p tcp-m state -- state NEW-m tcp -- dport 9899-j ACCEPT

[Root @ www ~] #/Etc/init. d/iptables save

[Root @ www ~] #/Etc/init. d/iptables restart

2) modify the ssh port configuration file

[Root @ www ~] # Vi/etc/ssh/sshd_config

Add Port 9899 under Port # Port 22

# Port 22

Port 9899

[Root @ www ~] # Service sshd restart

3) remote connection to CentOS

4) prohibit root users from logging on remotely through ssh.
[Root @ www ~] # Vi/etc/ssh/sshd_config
PermitRootLogin yes is changed to PermitRootLogin no, and the preceding comment # is canceled so that the root user cannot log on remotely! You can log in with a common account. to use the root account, run the su root command to switch to the root account.

# PermitRootLogin yes

PermitRootLogin no