centos修改ssh連接埠

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1、編輯防火牆配置：
vi /etc/sysconfig/iptables
防火牆增加新連接埠2222
-A INPUT -m state --state NEW -m tcp -p tcp --dport 2222 -j ACCEPT
======================================================================
# Firewall configuration written by system-config-firewall
# Manual customization of this file is not recommended.
*filter
: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 2222 -j ACCEPT
-A INPUT -j REJECT –reject-with icmp-host-prohibited
-A FORWARD -j REJECT –reject-with icmp-host-prohibited
COMMIT
重啟防火牆,使配置生效:
/etc/init.d/iptables restart或
service iptables restart

2、備份ssh連接埠設定檔
cp /etc/ssh/ssh_config /etc/ssh/ssh_configbak
cp /etc/ssh/sshd_config /etc/ssh/sshd_configbak
修改ssh連接埠為：2222
vi /etc/ssh/sshd_config
在連接埠#Port 22下面增加Port 2222
vi /etc/ssh/ssh_config
在連接埠#Port 22下面增加Port 2222
重啟：
/etc/init.d/sshd restart 或
service sshd restart
用2222連接埠可以正常串連之後，再返回去重複上面的步驟。把22連接埠禁用了，以後ssh就只能用2222連接埠串連了！

centos修改ssh連接埠