Disable TCP Auto-Tuning to Solve Slow Network, Cannot Load Web Page or Download Email Problems in Vista禁用的TCP自动调谐，以解决慢速网络，无法载入网页或下载电子邮件的问题，在Vista

When Windows Vista is connected to high speed broadband Internet connection, there may be some incompatibilities and conflict problem or error such as the following:当Windows Vista连接到高速宽带互联网连接，可能会有一些不兼容和冲突的问题或错误，如下列：

• Poor intermittent network performance.穷人的间歇性的网络性能。
• Slow network loading.慢速网络负荷。
• Unable to open and load some websites or webpages using Internet Explorer or Firefox, where the blue loading bar keeps running for a long time, but the pages fail to load.无法打开和负载一些网站或网页使用Internet Explorer或Firefox ，那里的蓝色加载酒吧不断运行相当长的时间，但页面装载失败。
• Java applets fail to download and open. Java applets的失败下载并打开。
• Cannot receive email or download from POP3 mail server by email clients such as Thunderbird.无法接收电子邮件或下载的POP3邮件服务器的电子邮件客户端，例如Thunderbird的。 No mail arrived although users may see the message “receiving 1 of 3 messages”, and eventually the receiving process will time out with the error number 0×800CCC19 timeout.没有邮件抵达，虽然用户可能会看到消息“接收1 3的讯息” ，并最终接收的过程中会的时间与错误号码0 × 800ccc19超时。
• Slow email sending or retrieval using Thunderbird and other clients.缓慢，电子邮件发送或检索使用Thunderbird和其他客户。

The symptoms exist due to the new re-written TCP stack in Windows Vista that aims to take full advantage of hardware advances such as gigabit networking.症状存在，由于新的转口书面的TCP栈在Windows Vista ，目的是为了充分利用硬件的进步，如千兆位网络。 Among the new feature in Windows Vista TCP/IP is Receive Window Auto-Tuning Level for TCP connections.其中的新功能在Windows Vista中的TCP / IP是接收窗口自动调谐水平的TCP连接。 TCP AutoTuning enables TCP连接自动调谐，使 TCP window scaling的TCP window scaling by default and automatically tunes the TCP receive window size for each individual connection based on the bandwidth delay product (BDP) and the rate at which the application reads data from the connection, and no longer need to manually change TcpWindowSize registry key value which applies to all connection.默认情况下，并自动调TCP接收窗口的大小为每一个人连接的基础上，带宽拖延产品（发展局）和速度，其中读取数据的应用，从连接，不再需要手动更改TcpWindowSize登录的关键价值，适用于所有的连接。 Theoretically, with TCP auto-tuning, network connection throughput in Windows Vista should be improved for best performance and efficiency, without registry tweak or hack.理论上，使用TCP自动调谐，网络连接的吞吐量在Windows Vista中应加以改善为最佳性能和效率，没有注册表调整或开刀。 However, this is not always the case, and may cause some Internet related issues and problems.不过，这是情况并非总是如此，并可能导致一些与互联网有关的问题和困难。

The workaround or solution to the above problem is to disable the TCP/IP AutoTuning in Windows Vista.其他可行方案或解决上述的问题是要禁用TCP / IP的自动调谐在Windows Vista中。 Disabling auto tuning of TCP Windows Size should not cause any negative effects, only that TCP Window Size will always at default value without ability to optimization to each connection.禁用自动调谐的TCP的Windows大小，应不会造成任何负面影响，只是TCP窗口大小将始终处于默认值没有能力优化，以每个连接。 Anyway, if there is any side effect after turn off auto tuning, simply re-enable back it.无论如何，如果有任何副作用后，关闭自动调整，只需重新启用它备份。

Check the state or current setting of TCP Auto-Tuning 检查的国家或目前的设定的TCP自动调谐

1. Open elevated command prompt开放提升的命令提示符 with administrator’s privileges.与管理员的特权。
2. Type the following command and press Enter:键入以下命令，并按下ENTER ：

   netsh interface tcp show global在netsh界面的TCP显示，全球

   The system will display the following text on screen, where you can check on the Auto-Tuning setting:该系统将显示以下文本在屏幕上，您可以在这里检查就自动调谐设置：

   Querying active state…查询活跃的国家…

   TCP Global Parameters全球的TCP参数
   ———————————————- ----------------
   Receive-Side Scaling State : enabled接收方结垢状态：启用
   Chimney Offload State : enabled烟囱卸载状态：启用
   Receive Window Auto-Tuning Level : normal接收窗口自动调谐水平：正常
   Add-On Congestion Control Provider : none添加拥塞控制供应商：无
   ECN Capability : disabled ECN的能力：残疾人士
   RFC 1323 Timestamps : disabled RFC 1323所时间戳：残疾人士

Disable TCP Auto-Tuning 禁用的TCP自动调谐

1. Open elevated command prompt开放提升的命令提示符 with administrator’s privileges.与管理员的特权。
2. Type the following command and press Enter:键入以下命令，并按下ENTER ：

   netsh interface tcp set global autotuning=disabled在netsh界面的TCP设置全球自动调谐=禁用

Enable TCP Auto-Tuning 启用TCP自动调谐

1. Open elevated command prompt开放提升的命令提示符 with administrator’s privileges.与管理员的特权。
2. Type the following command and press Enter:键入以下命令，并按下ENTER ：

   netsh interface tcp set global autotuning=normal在netsh界面的TCP设置全球自动调谐=正常

IMPORTANT : You're reading a machine translated page which is provided "as is" without warranty. 重要说明：您正在阅读的机器翻译网页是“按原样”提供的担保。 Unlike human translation, machine translation does not understand the grammar, semantics, syntax, idioms of natural language, thus often produce inaccurate and low quality text which is misleading and incomprehensible.不像人类翻译，机器翻译不明白的语法，语义，语法，成语自然语言，因此，往往产生不准确的和低品质的文字，是具误导性的和难以理解的。 Thus, please refer to因此，请参阅 original English article英文原版的文章 whenever possible.只要有可能。

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