linux telnet 之 telnet: Unable to connect to remote host: Connection refused

来源：互联网发布：淘宝设置信用卡支付编辑：程序博客网时间：2024/05/17 02:58

今天尝试telnet 利用 common.net 包中的 TelnetClient 来登陆linux并监控各种服务和运行脚本信息，在服务器中telnet 本机地址报错为
[root@dz_cj ~]# telnet 134.36.17.190
Trying 134.36.17.190...
telnet: connect to address 134.36.17.190: Connection refused

telnet: Unable to connect to remote host: Connection refused

1：首先查看telnet 服务是否开启：

chkconfig --list|grep telne

<span style="white-space:pre"></span>[root@dz_cj ~]# chkconfig --list|grep telnet        <span style="white-space:pre"></span>ekrb5-telnet:   关闭        <span style="white-space:pre"></span>krb5-telnet:    关闭        <span style="white-space:pre"></span>telnet:         启用

         1：开启：   <span style="font-family: 'Courier New'; line-height: 1.5 !important;">chkconfig krb5</span><span style="font-family: 'Courier New'; line-height: 1.5 !important;">-</span><span style="font-family: 'Courier New'; line-height: 1.5 !important;">telnet on   无需开启 </span><span style="line-height: 25.2000007629395px; font-family: 'Courier New';">ekrb5-telnet 服务  -- 如果关闭的话用 </span><pre name="code" class="html" style="color: rgb(51, 51, 51); font-size: 14px; line-height: 25.2000007629395px;"><span style="font-family: 'Courier New'; line-height: 1.5 !important;"><span style="white-space:pre"></span>chkconfig krb5</span><span style="font-family: 'Courier New'; line-height: 1.5 !important;">-</span><span style="font-family: 'Courier New'; line-height: 1.5 !important;">telnet off</span>

<span style="line-height: 25.2000007629395px; font-family: 'Courier New';"><span style="white-space:pre"></span>2：激活：   <span style="font-family: 'Courier New'; line-height: 1.5 !important;">chkconfig krb5</span><span style="font-family: 'Courier New'; line-height: 1.5 !important;">-</span><span style="font-family: 'Courier New'; line-height: 1.5 !important;">telnet on</span></span>

<span style="line-height: 25.2000007629395px; font-family: 'Courier New';"><span style="font-family: 'Courier New'; line-height: 1.5 !important;"></span></span>

<span style="line-height: 25.2000007629395px; font-family: 'Courier New';"><span style="font-family: 'Courier New'; line-height: 1.5 !important;"><span style="white-space:pre"></span>开启后再次进行telnet  显示为：</span></span>

<span style="line-height: 25.2000007629395px; font-family: 'Courier New';"><span style="font-family: 'Courier New'; line-height: 1.5 !important;"><span style="white-space:pre"></span></span></span><pre name="code" class="html">[root@dz_cj ~]# telnet 134.36.17.190Trying 134.36.17.190...Connected to dz_cj (134.36.17.190).Escape character is '^]'.Unencrypted connection refused. Goodbye.Connection closed by foreign host.

   表示可以连接，但是这里 <span style="font-family: 'Courier New';">Unencrypted connection refused. Goodbye.</span>

<span style="font-family: 'Courier New';"></span><p style="color: rgb(51, 51, 51); font-family: tahoma, 宋体; font-size: 14px; line-height: 22.3999996185303px; text-align: justify; background-color: rgb(250, 250, 252);">1）将文件/etc/xinetd.d/ekrb5-telnet里面的参数“disable”改成：</p><p style="color: rgb(51, 51, 51); font-family: tahoma, 宋体; font-size: 14px; line-height: 22.3999996185303px; text-align: justify; background-color: rgb(250, 250, 252);">disable=yes</p><p style="color: rgb(51, 51, 51); font-family: tahoma, 宋体; font-size: 14px; line-height: 22.3999996185303px; text-align: justify; background-color: rgb(250, 250, 252);">2）重启xinetd服务：</p><p style="color: rgb(51, 51, 51); font-family: tahoma, 宋体; font-size: 14px; line-height: 22.3999996185303px; text-align: justify; background-color: rgb(250, 250, 252);">service xinetd restart</p><p style="color: rgb(51, 51, 51); font-family: tahoma, 宋体; font-size: 14px; line-height: 22.3999996185303px; text-align: justify; background-color: rgb(250, 250, 252);">3）防止系统再次更改该参数值，执行：</p><p style="color: rgb(51, 51, 51); font-family: tahoma, 宋体; font-size: 14px; line-height: 22.3999996185303px; text-align: justify; background-color: rgb(250, 250, 252);">chkconfig ekrb5-telnet off</p><p style="color: rgb(51, 51, 51); font-family: tahoma, 宋体; font-size: 14px; line-height: 22.3999996185303px; text-align: justify; background-color: rgb(250, 250, 252);"></p>搞定！

0 0