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无法连接Linux 实例？

首先，请确保您的云服务器上已绑定公网IP并且是开机状态。您可通过VNC连接到Linux实例。请参阅使用Linux服务器。

无法连接Linux实例的排查思路：

1、 主机内网IP获取是否正常？ 以及您当地所在运营商对我们业务网关的连通性。

故障现象：无法远程主机
解决方法：通过VNC连接主机，在主机内部查看网卡的信息是否获取到内网IP。
步骤：查看云服务器控制台-内网IP，例如是内网IP是【192.168.0.171】

在云服务器列表的“更多操作”中，点击【连接】按钮，通过VNC连接到Linux云服务器。

输入帐户名“root”和操作系统密码登录。

输入 ifconfig 命令行，查看云服务器网卡的信息看是否获取到内网IP。如果出现内网IP【192.168.0.171】，则获取内网IP正常。

在主机内ping 一下 www.google.com 测试一下网络连通性。
执行 ping www.google.com 命令。出现如下图所示，则说明主机访问外网是通的。

如果主机访问外网不通的，则在主机内ping 一下节点（如美国）的内网网关及外网网关。每个地区的云服务器网关会存在差异，可咨询客服或者提工单获取对应云服务器的网关信息。

本地电脑也可ping 一下节点（如美国）的内网网关及外网网关，验证您当地所在运营商对我们业务网关的连通性。

2、 防火墙配置是否正确？

查看防火墙配置规则是否正确，例如您想访问80端口，本来是要配置入站规则，但配置成了出站规则，则访问80端口不通。如果防火墙配置正确，仍然访问端口不通，则请提交工单或者联系客服。

3、 安全组公网规则

故障现象：无法连接到云服务器，排查防火墙，内网IP配置无误后，仍然无法连接到云服务器。
可能原因：云服务器安全组默认的公网规则被删除，或者是云服务器中没有此端口服务。
解决方案：重新配置云服务器的安全组公网规则，添加入站ICMP协议和开放22端口和3389端口。如果是要查看云服务器中有哪些端口服务，则执行netstat –ant 命令行，查看端口情况。

查看云服务器是否有端口服务

4、 远程端口访问异常

可能原因：1、 主机状态为关机状态 2、 修改了远程端口 3、IP被运营商封停。

5、 CPU负载过高

故障现象：云服务器CPU 负载过高导致系统无法进行远程连接。
解决办法：运行 top 命令，查看程序运行的负载情况。若应用程序有大量的磁盘访问/网络访问行为/高计算需求，高 CPU 是正常结果。您可以尝试升配实例规格来解决资源瓶颈问题。

运行top命令，查看程序运行的负载情况

最后尝试重启实例
重启操作会使实例停止工作，从而中断业务，请谨慎执行。
注意：重启实例前，需对实例创建快照，用于数据备份或者系统回滚
在控制台重启实例。重启实例后，请再次尝试实例连接。

通过上述排查后，若 ECS 实例仍不能连接，请您记录前述各步骤的排查结果、相关日志信息或截图及主机密码，然后联系技术支持。

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