blocks|key|130631|text|碰巧，这是埃及is默认DNS服务器的一个问题，这些服务器很可能阻塞了一些Microsoft服务器。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|130632|解决方案(如果你住在埃及)：|130633|在Windows上使用ipconfig+/flushdns命令清除DNS缓存(用于其他操作系统)。|ordered-list-item|offset|length|style|CODE|130634|将路由器设置中的默认DNS服务器更改为Google的8.8.8.8和8.8.4.4+(或Cloudflare的1.1.1.1或其他您信任的DNS服务器)。|130635|重新启动VSCode并尝试安装扩展。|130636|希望现在一切都会好起来。|130637|请查看此Github问题以获取更多信息。|130638|entityMap|0|LINK|mutability|MUTABLE|url|https://www.a2hosting.com/kb/getting-started-guide/internet-and-networking/clearing-the-dns-cache-on-your-computer|1|https://github.com/microsoft/vscode/issues/95427^0|0|0|B|I|15|6|0|0|0|0|0|4|8|1|0^^$0|@$1|2|3|4|5|6|7|12|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|13|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|14|8|@$G|15|H|16|I|J]]|9|@$G|17|H|18|1|19]]|A|$]]|$1|K|3|L|5|F|7|1A|8|@]|9|@]|A|$]]|$1|M|3|N|5|F|7|1B|8|@]|9|@]|A|$]]|$1|O|3|P|5|6|7|1C|8|@]|9|@]|A|$]]|$1|Q|3|R|5|6|7|1D|8|@]|9|@$G|1E|H|1F|1|1G]]|A|$]]|$1|S|3|-4|5|6|7|1H|8|@]|9|@]|A|$]]]|T|$U|$5|V|W|X|A|$Y|Z]]|10|$5|V|W|X|A|$Y|11]]]]

It happens that, this is a problem with the Egyptian ISPs' default DNS servers, which are most probably blocking some of Microsoft servers.
The solution (in case you live in Egypt):
<ol>
<li>clear DNS cache using <code>ipconfig /flushdns</code> command on Windows cmd (For <a href="https://www.a2hosting.com/kb/getting-started-guide/internet-and-networking/clearing-the-dns-cache-on-your-computer" rel="noreferrer">Other OS</a>).</li>
<li>change the default DNS servers in your router settings to Google's 8.8.8.8 &amp; 8.8.4.4 (or Cloudflare's 1.1.1.1 or any other DNS server you trust).</li>
<li>restart VSCode and try installing extensions.</li>
</ol>
Hopefully, everything will work fine by now.
Check this <a href="https://github.com/microsoft/vscode/issues/95427" rel="noreferrer">Github issue</a> for more insight.

blocks|key|128884|text|在ubuntu中，转到设置->+wifi+->，单击齿轮图标->+IP4+->+dns输入并放置|type|unstyled|depth|inlineStyleRanges|entityRanges|data|128885|8.8.8.8,8.8.4.4|code-block|syntax|javascript|128886|然后单击apply，到DNS+Resolver缓存开放终端并键入：-|128887|sudo+systemd-resolve+--flush-caches
sudo+systemctl+restart+systemd-resolved|128888|重新启动设备|128889|entityMap^0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|Q|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|R|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|S|8|@]|9|@]|A|$]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

in ubuntu go to settings -> wifi -> click on gear icon -> IP4 -> dns input
and put 

<pre><code>8.8.8.8,8.8.4.4
</code></pre>

and click apply,
to DNS Resolver Cache open terminal and type:-

<pre><code>sudo systemd-resolve --flush-caches
sudo systemctl restart systemd-resolved
</code></pre>

restart your device

blocks|key|2116183|text|我在代码中得到了"XHR失败“错误。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2116184|因此，我更改了我的网络设置，以使用Google+(使用说明)|offset|length|2116185|最后，在使用说明+(由mokhtar)为我解决之后：|2116186|转到:控制面板\网络和Internet\网络连接|unordered-list-item|2116187|选择连接网络并(右键单击它，然后选择属性)|2116188|选择“Internet协议版本4(TCP/IPv4+4)”，然后单击本节底部的属性|2116189|在“常规”部分单击“使用下列DNS服务器地址：”|2116190|制作“首选DNS服务器:+8.8.8.8”(如果遇到问题，请检查这)|2116191|制作“备用DNS服务器:+8.8.4.4”|2116192|重新启动VS代码|2116193|entityMap|0|LINK|mutability|MUTABLE|url|https://developers.google.com/speed/public-dns/docs/using|1|https://github.com/microsoft/vscode/issues/34385|2|https://superuser.com/questions/1090131/the-dns-server-is-not-a-valid-ip-address-error^0|0|P|4|0|0|4|4|1|0|0|0|0|0|W|1|2|0|0|0^^$0|@$1|2|3|4|5|6|7|18|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|19|8|@]|9|@$D|1A|E|1B|1|1C]]|A|$]]|$1|F|3|G|5|6|7|1D|8|@]|9|@$D|1E|E|1F|1|1G]]|A|$]]|$1|H|3|I|5|J|7|1H|8|@]|9|@]|A|$]]|$1|K|3|L|5|J|7|1I|8|@]|9|@]|A|$]]|$1|M|3|N|5|J|7|1J|8|@]|9|@]|A|$]]|$1|O|3|P|5|J|7|1K|8|@]|9|@]|A|$]]|$1|Q|3|R|5|J|7|1L|8|@]|9|@$D|1M|E|1N|1|1O]]|A|$]]|$1|S|3|T|5|J|7|1P|8|@]|9|@]|A|$]]|$1|U|3|V|5|J|7|1Q|8|@]|9|@]|A|$]]|$1|W|3|-4|5|6|7|1R|8|@]|9|@]|A|$]]]|X|$Y|$5|Z|10|11|A|$12|13]]|14|$5|Z|10|11|A|$12|15]]|16|$5|Z|10|11|A|$12|17]]]]

I got this &quot;XHR failed&quot; error in Visual Studio Code.
So I changed my network settings to use Google Public DNS (<a href="https://developers.google.com/speed/public-dns/docs/using" rel="nofollow noreferrer">instructions</a>)
Finally following <a href="https://github.com/microsoft/vscode/issues/34385" rel="nofollow noreferrer">instructions</a> (by mohamed-mokhtar) solved for me:
<ul>
<li>Go to : Control Panel\Network and Internet\Network Connections</li>
<li>Choose your connection network and ( right click on it then choose properties )</li>
<li>Select &quot; Internet Protocol Version 4 (TCP/IPv4) and then click on properties in the bottom of this section</li>
<li>At General section click on &quot; Use the following DNS Server address : &quot;</li>
<li>Make &quot; Preferred DNS server : 8.8.8.8 &quot; (if you face a problem check <a href="https://superuser.com/questions/1090131/the-dns-server-is-not-a-valid-ip-address-error">this</a>)</li>
<li>Make &quot; Alternate DNS server : 8.8.4.4 &quot;</li>
<li>Restart VS code</li>
</ul>

blocks|key|128910|text|参考@Seif+A.的答案|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|128911|解决方案(万一你住在埃及)|128912|使用Windows+cmd上的命令清除DNS缓存：|128913|ipconfig+/flushdns|code-block|syntax|javascript|128914|将路由器设置中的默认DNS服务器更改为Google的：|128915|8.8.8.8+,+8.8.4.4++>>+for+IPv4
2001:4860:4860::8888+,+2001:4860:4860::8844++>>+for+IPv6|128916|重新启动VSCode并尝试安装扩展。|128917|entityMap^0|2|8|0|0|0|0|0|0|4|6|0^^$0|@$1|2|3|4|5|6|7|W|8|@$9|X|A|Y|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|Z|8|@]|D|@]|E|$]]|$1|H|3|I|5|6|7|10|8|@]|D|@]|E|$]]|$1|J|3|K|5|L|7|11|8|@]|D|@]|E|$M|N]]|$1|O|3|P|5|6|7|12|8|@]|D|@]|E|$]]|$1|Q|3|R|5|L|7|13|8|@]|D|@]|E|$M|N]]|$1|S|3|T|5|6|7|14|8|@$9|15|A|16|B|C]]|D|@]|E|$]]|$1|U|3|-4|5|6|7|17|8|@]|D|@]|E|$]]]|V|$]]

referring to @Seif A. answer
The solution (in case you live in Egypt)
clear DNS cache using command on Windows cmd:
<pre><code>ipconfig /flushdns
</code></pre>
change the default DNS servers in your router settings to Google's:
<pre><code>8.8.8.8 , 8.8.4.4 &gt;&gt; for IPv4
2001:4860:4860::8888 , 2001:4860:4860::8844 &gt;&gt; for IPv6
</code></pre>
restart VSCode and try installing extensions.

blocks|key|128919|text|这可能是因为证书检查。|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|128920|下面的解决方案在CentOS+7+(Linux)中适用于我。|128921|步骤1.更改文件/usr/share/applications/code.desktop|CODE|128922|打开文件/usr/share/applications/code.desktop，然后在%25F之前添加--ignore-certificate-errors来修改Exec值|128923|Exec=/usr/share/code/code+--unity-launch+--ignore-certificate-errors+%25F|code-block|syntax|javascript|128924|开始时输入sudo保存文件。|128925|​|128926|📷|atomic|128927|128928|步骤2.关闭vs代码实例的所有窗口。|128929|步骤3.返回终端，使用下面的命令打开VS代码：|128930|code+--ignore-certificate-errors|128931|步骤4.单击左侧栏中的扩展按钮。|128932|点击彭丽芙的任何像"Ruby“这样的扩展，如果Details页面中的图像能够被成功地看到，这个问题也许就解决了。|128933|步骤5.试图继续安装所需的扩展。|128934|好好享受吧！希望这对你有帮助。|128935|entityMap|0|IMAGE|mutability|IMMUTABLE|imageUrl|https://developer.qcloudimg.com/http-save/yehe-900000/3ef8c1968db652a0270f4cd8262b6348.png|imageAlt^0|6|4|0|0|0|4|8|10|0|4|10|18|2|1E|R|0|0|5|4|0|0|0|1|0|0|0|0|4|0|0|N|0|0|0|G|0|0|1K|N|7|0|0|G|0|0|F|0^^$0|@$1|2|3|4|5|6|7|1M|8|@$9|1N|A|1O|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|1P|8|@]|D|@]|E|$]]|$1|H|3|I|5|6|7|1Q|8|@$9|1R|A|1S|B|C]|$9|1T|A|1U|B|J]]|D|@]|E|$]]|$1|K|3|L|5|6|7|1V|8|@$9|1W|A|1X|B|J]|$9|1Y|A|1Z|B|J]|$9|20|A|21|B|J]]|D|@]|E|$]]|$1|M|3|N|5|O|7|22|8|@]|D|@]|E|$P|Q]]|$1|R|3|S|5|6|7|23|8|@$9|24|A|25|B|J]]|D|@]|E|$]]|$1|T|3|U|5|6|7|26|8|@]|D|@]|E|$]]|$1|V|3|W|5|X|7|27|8|@]|D|@$9|28|A|29|1|2A]]|E|$]]|$1|Y|3|U|5|6|7|2B|8|@]|D|@]|E|$]]|$1|Z|3|10|5|6|7|2C|8|@$9|2D|A|2E|B|C]]|D|@]|E|$]]|$1|11|3|12|5|6|7|2F|8|@$9|2G|A|2H|B|C]]|D|@]|E|$]]|$1|13|3|14|5|O|7|2I|8|@]|D|@]|E|$P|Q]]|$1|15|3|16|5|6|7|2J|8|@$9|2K|A|2L|B|C]]|D|@]|E|$]]|$1|17|3|18|5|6|7|2M|8|@$9|2N|A|2O|B|C]|$9|2P|A|2Q|B|J]]|D|@]|E|$]]|$1|19|3|1A|5|6|7|2R|8|@$9|2S|A|2T|B|C]]|D|@]|E|$]]|$1|1B|3|1C|5|6|7|2U|8|@$9|2V|A|2W|B|C]]|D|@]|E|$]]|$1|1D|3|-4|5|6|7|2X|8|@]|D|@]|E|$]]]|1E|$1F|$5|1G|1H|1I|E|$1J|1K|1L|-4]]]]

It probably is because of the certificate check.
Below solution works for me in CentOS 7 (Linux).
Step 1. Change the file <code>/usr/share/applications/code.desktop</code>
Open the file <code>/usr/share/applications/code.desktop</code>,
then modify the Exec value with adding <code>--ignore-certificate-errors</code> before <code>%F</code>:
<pre><code>Exec=/usr/share/code/code --unity-launch --ignore-certificate-errors %F
</code></pre>
Save the file with typing <code>sudo</code> in the begining.
<a href="https://i.stack.imgur.com/FWgy2.png" rel="noreferrer"><img src="https://i.stack.imgur.com/FWgy2.png" alt="the file code.desktop" /></a>
Step 2. Close all windows of vs code instances.
Step 3. Back to the terminal, use below command to open VS code:
<pre class="lang-sh prettyprint-override"><code>code --ignore-certificate-errors
</code></pre>
Step 4. Click extension button in the left side bar.
Click any extension like &quot;Ruby&quot; by Peng Lv, if the images in the <code>Details</code> page can be seen successfully, perhaps the issue is solved.
Step 5. Try to continue to install the extensions you need.
Just enjoy! May it be helpful for you.

blocks|key|731899|text|如果你在一个公司网络中，并且它被封锁了，最后的办法是手动从允许它的域上的网站下载VSIX，然后复制VSIX并安装它。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|731900|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

If you're in a corporate network and it's locked down the one last resort is to manually download the VSIX from the website on a domain that will allow it and then copy over the VSIX and install it.

blocks|key|2116325|text|只需安装一个VPN类似于betternet或任何其他VPN软件，并将国家改为美国或尝试其他国家。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2116326|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

Just install a VPN like betternet or any other VPN software and change the country to the USA or try other countries.

blocks|key|128990|text|在vs代码中添加新的扩展时，我也遇到了同样的问题。在埃及，我认识到ISP内部的问题，所以我将路由器中的DNS更改为Google+DNS提供者，它工作得很好。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|128991|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

I faced the same problem while adding new extension in vs code.
I Recognized the problem within the ISP in Egypt, so I changed the DNS in My router to Google DNS Providers , and it works perfectly

blocks|key|2116392|text|解决方案|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2116393|在Windows上使用命令清除DNS缓存:+ipconfig+/flushdns|ordered-list-item|2116394|将路由器设置中的默认DNS服务器更改为Google的：
8.8.8.8，8.8.4.4+>>+for+IPv4
2001年:4860:4860:8888,2001:4860:4860:4844+>>+for+IPv6
此链接将指导您如何更改windows和mac：https://www.ionos.com/digitalguide/server/configuration/how-to-change-dns-server/中的DNS服务器。|offset|length|2116395|重新启动VSCode并尝试安装扩展。|2116396|entityMap|0|LINK|mutability|MUTABLE|url|https://www.ionos.com/digitalguide/server/configuration/how-to-change-dns-server/^0|0|0|3O|29|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|T|8|@]|9|@]|A|$]]|$1|E|3|F|5|D|7|U|8|@]|9|@$G|V|H|W|1|X]]|A|$]]|$1|I|3|J|5|D|7|Y|8|@]|9|@]|A|$]]|$1|K|3|-4|5|6|7|Z|8|@]|9|@]|A|$]]]|L|$M|$5|N|O|P|A|$Q|R]]]]

The solution
<ol>
<li>clear DNS cache using command on Windows cmd:
ipconfig /flushdns
</li>
<li>change the default DNS servers in your router settings to Google's:
8.8.8.8 , 8.8.4.4 &gt;&gt; for IPv4
2001:4860:4860::8888 , 2001:4860:4860::8844 &gt;&gt; for IPv6
This link will guide you how to change the DNS server in windows and mac:
<a href="https://www.ionos.com/digitalguide/server/configuration/how-to-change-dns-server/" rel="nofollow noreferrer">https://www.ionos.com/digitalguide/server/configuration/how-to-change-dns-server/</a>
</li>
<li>restart VSCode and try installing extensions.
</li>
</ol>

blocks|key|130754|text|在我的例子中，我需要禁用工作VPN来下载扩展。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|130755|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

In my case I was need to disable work VPN to download extension

blocks|key|732061|text|适用于窗户|type|unstyled|depth|inlineStyleRanges|entityRanges|data|732062|++++cd+"C:\Users\<user>\Appdata\Local\Programs\Microsoft+VS+Code"
++++code.exe+--ignore-certificate-errors|code-block|syntax|javascript|732063|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

For windows
<pre><code> cd &quot;C:\Users\&lt;user&gt;\Appdata\Local\Programs\Microsoft VS Code&quot;
 code.exe --ignore-certificate-errors
</code></pre>

This is my first time installing and using VSCode, and when I tried installing <a href="https://marketplace.visualstudio.com/items?itemName=esbenp.prettier-vscode" rel="noreferrer">Prettier</a> extension, it let me peek quickly at the extension page before closing it and displaying this notification (Screenshot attached): 

<blockquote>
 Unable to open 'Extension: Prettier - Code formatter': An unknown error occurred. Please consult the log for more details..
</blockquote>

<a href="https://i.stack.imgur.com/oxPxk.jpg" rel="noreferrer">VSCode screenshot: Notification at bottom right</a>

It's doing this with all other extensions. Searched for a solution but found nothing applicable.
Why is this happening and how to fix it?

Why is VSCode "Unable to open Extension. An unknown error occurred."?

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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这是我第一次安装和使用VSCode，当我尝试安装扩展时，它让我可以在关闭扩展页面并显示此通知之前快速查看它(随附的屏幕快照)：无法打开“扩展:更漂亮的代码格式化程序”：发生了未知错误。详情请参阅日志。它用其他所有的扩展来完成这个任务。寻找解决方案，但没有发现任何适用的方法。为什么会发生这种情况，以及如何解决？

问为什么VSCode“无法打开扩展。发生了一个未知的错误。”
EN

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问为什么VSCode“无法打开扩展。发生了一个未知的错误。”EN