Cannot Display the Webpage and Host/Server Not Found or Available Error - EnablePMTUDiscovery MTU Fix无法显示网页和主机/服务器没有发现或提供错误-将E nablePMTUDiscovery的M TU修复

When visiting or browsing a web page using any web browser such as Internet Explorer and Firefox, occasionally will display error messages such as “Internet Explorer cannot display the webpage” or “Server Not Found”.当访问或浏览网页，使用任何Web浏览器，如Internet Explorer和Firefox ，偶尔会显示错误讯息，如“ Internet Explorer无法显示该网页”或“找不到服务器” 。 Beside, when connecting to a remote server, the connection may return “Host not available” error too.旁边，当连接到一台远程服务器，连接可能会返回“主机无法使用”错误太多。

There are many possible reasons that may cause the above issues.有很多可能的原因可能会导致上述问题。 Most likely cause will be network connectivity issue, such as disconnection, DNS resolving problem, or remote web server issue, which may be temporarily down.最可能的原因将网络连接问题，如断线， DNS的解决问题，或远程Web服务器的问题，这可能是暂时停机。 If you have ensured that this issues is non-existent and no problem exists on your own system or on ISP network, and have tried如果您已确保这个问题是不存在的和没有问题的存在对自己的系统或对ISP网络，并已尝试 various solutions specific to Vista network problems各种解决办法，具体到Vista的网络问题 , try the following trick. ，请尝试以下的伎俩。

1. Run Registry Editor by typing regedit in Start Search and press Enter key.运行注册表编辑器中键入的regedit开始搜索，并按下回车键。
2. Navigate to the following registry key:浏览到以下注册表项：

   HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters hkey_local_machine \系统\ currentcontrolset \服务\的TCPIP \参数

3. Locate and right click EnablePMTUDiscovery registry value in the right pane, and then select Modify option.找到并点击右键将EnablePMTUDiscovery注册表值在右窗格，然后选择修改选项。
4. In the value data text field, enter 1 as its new value, then click OK button.在数值数据文本字段中，输入1作为其新的价值，然后单击确定按钮。
5. Exit registry editor and restart computer.退出注册表编辑器并重新启动计算机。

Enabling registry key of使注册表的关键 EnablePMTUDiscovery将EnablePMTUDiscovery instructs TCP/IP to try to automatically detect the MTU for all networks along the path to a remote host, which may be different from the MTU of local network to avoid packet fragmentation so faster performance.指示的TCP / IP尝试自动侦测的MTU为所有网络沿远端主机的路径，其中可能有所不同的MTU本地网络，以避免数据包碎片，以便更快的性能。 Normally, this registry key does not exist in the registry, which when non is found, the system assume the feature is enabled.一般情况下，此注册表项不存在在注册表中，当非是发现，该系统承担功能是启用的。 Some programs or updates add in the EnablePMTUDiscovery registry key and disable it to harden the security.有些程式或更新添加，在将EnablePMTUDiscovery注册表项并禁用它强硬的安全。 When disabled, the registry key value data is “0″, and TCP/IP uses a default MTU size of 576 bytes for all communications across remote networks, which may intermittently cause problems and unreachable packets.当残疾人士，注册表项值的数据是“ 0 ” ，和TCP / IP使用默认的MTU大小为576字节的所有通讯全国远程网络，这可能会间歇性出现问题和无法包。

The trick may works on most Windows operating system such as Windows Vista, Windows XP and Windows 200x.把戏，工程可能对大多数的Windows作业系统，如Windows Vista中， Windows XP和Windows 200x中。

IMPORTANT : This is a machine translated page which is provided "as is" without warranty. 重要说明 ：这是一个机器翻译网页是“按原样”提供的担保。 Machine translation may be difficult to understand.机器翻译可能很难理解。 Please refer to请参阅 original English article英文原版的文章 whenever possible.只要有可能。

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This entry was posted on Sunday, March 2nd, 2008 at 11:01 pm and is filed under 此项目被张贴在周日， 2008年3月2日在下午11时01分，并提交下 Operating Systems 操作系统 . 。 You can follow any responses to this entry through the 您可以按照任何的反应，此项目通过 RSS 2.0 2.0 feed. 喂养。 You can 您可以 leave a response 留下的回应 , or ，或 trackback Trackback跟踪 from your own site. 从你自己的网站。