CentOS 5.3 Linux系統開啟telnet服務

1、CentOS 5.3預設已經安裝好了telnet軟體包
[root@zhuliting ~]# cat /etc/redhat-release
CentOS release 5.3 (Final)
[root@zhuliting ~]#  rpm -qa |grep telnet
telnet-server-0.17-39.el5
telnet-0.17-39.el5
如果沒有，就執行：
[root@zhuliting ~]# yum install telnet telnet-server
[note] telnet-server這個好像沒什麼用，沒有它也成功了
1、修改/etc/xinetd.d/krb5-telnet檔案：
service telnet
{
    ...
    disable        = yes
}
將其中的disalbe = yes 欄位，改為no
2、修改/etc/pam.d/remote檔案，將下面一行注釋掉：
auth       required     pam_securetty.so

3、在防火牆設定裡，將telnet設定為信任的服務，或者關閉防火牆。

4、、重啟telnet服務
[root@zhuliting ~]# service xinetd restart

否則，可能出現的錯誤：
1、
[root@zhuliting ~]## telnet zhuliting
Trying 192.168.149.166...
telnet: connect to address 192.168.149.183: Connection refused
telnet: Unable to connect to remote host: Connection refused

2、[root@zhuliting ~]# telnet zhuliting
Trying 192.168.149.166...
Connected to zhuliting (192.168.149.183).
Escape character is '^]'.

    zhuliting (Linux release 2.6.18-194.26.1.el5xen #1 SMP Tue Nov 9 14:13:46 EST 2010) (5)

login: root
Password:
Login incorrect
login: