Telnet是一個有效的遠程登錄協議。這里我們就來介紹一下Telnet服務的相關設置。那么我們主要通過幾個簡單的步驟來完成操作。那么具體的內容如下：

1、確定你的Telnet服務打開沒有:

[root@111 ~]# chkconfig --list|grep Telnet

ekrb5-Telnet: off

krb5-Telnet: off

[root@111 ~]#

注意檢查結果這里是關閉狀態

2、打開Telnet服務:

[root@111 ~]# chkconfig krb5-Telnet on

[root@111 ~]# chkconfig --list|grep Telnet

ekrb5-Telnet: offv

krb5-Telnet: on

[root@111 ~]#

檢查已經被打開了

3、修改登陸文件securetty,主要增加要登陸的終端點

[root@111 ~]# vi /etc/securetty

增加如下幾行:

pts/1

pts/2

pts/3

pts/4

pts/5

……

保存退出即可.

如果是chkconfig krb5-Telnet on

會提示Unencrypted connection refused. Goodbye.Connection closed by foreign host.看錯誤信息好像是說的為加密的連接被拒絕,查看了他的配置文件也沒發現有什么關于加密的選項,而且配置文件也很正確,于是到google上去搜索了一大圈,***終于找到一個老外寫的一個解決方法:

I really needed a bit of guidance and you provided it./sbin/chkconfig --list |grep TelnetThe above command told me I had both krb5-Telnet and ekrb5-Telnet, andalso the installed Telnet all on. Initially I did not know what theywere all for. After turning them on and off and testing my Telnetconnection from another box I realised that "ekrb5-Telnet" was theencrypted Telnet server that I needed to turn off to run "krb-Telnet"which allowed non-encrypted Telnet connections.eg /sbin/chkconfig ekrb5-Telnet off

原來ekrb5-Telnet是一個需要加密的Telnet服務,把這個服務啟動上當然就需要加密了.解決方法:將/etc/xinetd.d/ekrb5-Telnet里面的disable改成=yes,再重啟xinetd服務service xinetd restart就OK了!