在安裝完畢linux，預設的情況下ssh是開放的，容易受到黑客攻擊，簡單，有效的操作之一就是修改預設埠號 如下列，我們把22修改我2501 就是修改/etc/ssh/sshd_config   //注意，容易和ssh_config相混合 步驟一 [[email protected] ssh]# more sshd_config 
#       $OpenBSD: sshd_config,v 1.69 2004/05/23 23:59:53 dtucker Exp $ # This is the sshd server system-wide configuration file.  See
# sshd_config(5) for more information. # This sshd was compiled with PATH=/usr/local/bin:/bin:/usr/bin # The strategy used for options in the default sshd_config shipped with
# OpenSSH is to specify options with their default value where
# possible, but leave them commented.  Uncommented options change a
# default value. #Port 22             //先把22註釋掉
port 2501            //新增一個新的埠
#Protocol 2,1 步驟二 [[email protected] ~]# service sshd restart
Stopping sshd:[  OK  ]
Starting sshd:[  OK  ] 步驟三 用SecureCRT測試