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Win8.1系统Hosts文件失效的现象及解决方法

更新时间:2026-08-21 21:09:37 | 编辑:孤魂 | 信息来源:互联网

  不知大家是否遇到过Hosts文件失效的问题。原本我的Windows 8.1系统的Hosts文件可以正常使用,但是最近不知何故突然失效了。Hosts文件失效给我工作带来很多麻烦,为了分析具体原因,我给大家做个演示测试。

  可见hosts文件路径是对的,而且只有一行映射,确保没有其他的干扰项。  

  使用ipconfig /flushdns清理DNS缓存,而且其实我还停止了DNS Client服务的。然后继续ping,依然返回的是真实DNS解析的地址。  

  如图,可见system的权限也是有分配的。下面那个我自己的账户和Admin组的账户的权限也是完全控制的。

  情况就是这样,不知为何最近突然失效了。我可能是遇到什么劫持了么?

  分析处理

  根据引用中我的猜想,我使用了消息记录器来跟踪与hosts文件有关的系统消息。为了对比,我同时在windows 8.1和虚拟机中运行的windows XP下操作,以便作为对比。

  首先我发现其实所有有网络通信功能的程序都会去检测HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Dnscache\Parameters\这个键下面是否存在UseHostsFile值是否存在,数据是多少。但是我发现无论XP还是8.1都没有该值,但是根据之前的实验可知是XP可以正常读取hosts文件的,所以可以断定这个是无关项。(不过根据这个判断,原来Dnscache服务(也就是在服务中显示名称为DNS Client的服务,用于缓存DNS解析的结果)是可以手动强制不读取hosts文件的,修改这个键值即可)

  然后我发现一个怪异的现象,每次我手动修改hosts文件后,在8.1下会显示出一个名为svchost.exe的进程试图访问hosts文件但是结果为Acces Denied。在XP下,也有同样名称的进程试图访问hosts文件但是结果却是Success的。

  根据消息记录器提供的进程的PID,追踪到其承载的服务中有一个共同的服务就是DNS Client。于是可以断定肯定是上述提到的DNS Client服务出现问题了。因为出现访问文件被拒,肯定是帐户问题,于是我习惯性地打开DNS Client的属性页,转到登录选项卡,发现其使用的帐户不是默认本地系统帐户,而是名为“Network Service”的内置安全主体。

  到此一切都明了了,归根到底还是权限问题。DNS Client服务使用的帐户不是system,而是Network Service。虽然我给system帐户赋予了完全的访问控制,但是根据我开篇的截图可以发现,我里面缺少了Network Service的安全主体。而现在我们可以断定system帐户和Network Service安全主体是没有关联的,所以才导致了DNS Client服务启动后无法正常读取hosts文件,而导致hosts文件无效。

  解决办法就是:编辑etc文件夹的访问权限,添加Network Service安全主体并赋予至少允许读取的权限,然后重新启动DNS Client服务即可。目前我的hosts已经一切正常。

  通过以上的分析,相信大家能够更清楚地理解Windows 8.1系统下Hosts文件失效的原因,也能够掌握解决它的应对措施。最终,我们的Hosts文件可以恢复正常。


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  6. 当前时间: 2026-08-21 21:09:34
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  8. 请求路径: /anzhuang/33603.html
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