blocks|key|100425|text|type|unstyled|depth|inlineStyleRanges|entityRanges|data|100426|+Visual+Studio+-+Nuget+-无法加载源的服务索引|blockquote|100427|100428|100429|这是一个常见的错误，我们无法从这个错误消息中获得太多有用的信息。我们只能提供此问题的故障排除。|100430|大多数情况下，出现此问题的原因是网络问题或nuget.config中的配置不正确。|offset|length|style|CODE|100431|为了确定这个问题是否与VS集成开发环境、网络等相关，首先，请在浏览器中打开nuget服务器https://api.nuget.org/v3/index.json的路径。如果您可以在浏览器中打开它，则此问题可能更多地与VS+IDE/nuget.config有关。您可以删除%25appdata%25\Nuget中的nuget.config，然后重新启动Visual+Studio以生成新的nuget.config。|100432|其次，如果您也无法在浏览器中打开它，这个问题可能与网络问题有关，您应该检查我们的系统变量或IE浏览器中是否有代理变量http_proxy，我们可以在具有相同网络的另一台PC上测试它。如果您的PC中有代理设置，您可以将其删除以对其进行测试，也可以将代理设置添加到Nuget.Config文件中。有关详细信息，请参阅此链接：Nuget+Config+Section+&+Nuget+Proxy+Settings。在确认我们的PC中没有任何代理之后，我们应该检查我们的网络是否受到限制。我们可以用不同的网络来测试它。|100433|有关更多细节，请参阅the+same+issue。|100434|entityMap|0|LINK|mutability|MUTABLE|url|https://docs.nuget.org/ndocs/schema/nuget.config-file#config-section|1|http://skolima.blogspot.sg/2012/07/nuget-proxy-settings.html|2|https://stackoverflow.com/questions/41185443/nuget-connection-attempt-failed-unable-to-load-the-service-index-for-source^0|0|0|0|0|0|L|C|0|19|Z|3R|F|48|C|59|C|0|1M|A|4G|K|0|53|K|1|0|A|E|2|0^^$0|@$1|2|3|-4|4|5|6|15|7|@]|8|@]|9|$]]|$1|A|3|B|4|C|6|16|7|@]|8|@]|9|$]]|$1|D|3|-4|4|5|6|17|7|@]|8|@]|9|$]]|$1|E|3|-4|4|5|6|18|7|@]|8|@]|9|$]]|$1|F|3|G|4|5|6|19|7|@]|8|@]|9|$]]|$1|H|3|I|4|5|6|1A|7|@$J|1B|K|1C|L|M]]|8|@]|9|$]]|$1|N|3|O|4|5|6|1D|7|@$J|1E|K|1F|L|M]|$J|1G|K|1H|L|M]|$J|1I|K|1J|L|M]|$J|1K|K|1L|L|M]]|8|@]|9|$]]|$1|P|3|Q|4|5|6|1M|7|@$J|1N|K|1O|L|M]]|8|@$J|1P|K|1Q|1|1R]|$J|1S|K|1T|1|1U]]|9|$]]|$1|R|3|S|4|5|6|1V|7|@]|8|@$J|1W|K|1X|1|1Y]]|9|$]]|$1|T|3|-4|4|5|6|1Z|7|@]|8|@]|9|$]]]|U|$V|$4|W|X|Y|9|$Z|10]]|11|$4|W|X|Y|9|$Z|12]]|13|$4|W|X|Y|9|$Z|14]]]]

<blockquote>
 Visual Studio - Nuget - Unable to load the service index for source
</blockquote>

This is a common error, we could not get much useful info from this error message. We could only provide the troubleshootings for this issue.

The reason for this issue in most cases is because the network issue or the incorrect configuration in the <code>nuget.config</code>.

In order to make sure that whether this issue is related to the VS IDE, the network or others, first, please open the path of the nuget server <code>https://api.nuget.org/v3/index.json</code> in the browser. If you can open it in the browser, this issue probably more related to the VS IDE/nuget.config. You can delete <code>nuget.config</code> in the <code>%appdata%\Nuget</code>, then restart the Visual Studio to generate the new <code>nuget.config</code>. 

Second, if you also could not open it in the browser, this issue probably related to the network issue, you should check if you have proxy variable <code>http_proxy</code> in our system variables or in the IE browser, we could test it on another PC with same network. if you have the proxy settings in your PC, you can remove it to test it or you can add proxy settings into Nuget.Config file. Refer to this link for details: <a href="https://docs.nuget.org/ndocs/schema/nuget.config-file#config-section" rel="noreferrer">Nuget Config Section</a> &amp; <a href="http://skolima.blogspot.sg/2012/07/nuget-proxy-settings.html" rel="noreferrer">Nuget Proxy Settings</a>. After we confirm we do not have any proxy in our PC, then we should to check if our network is limited. We could test it with a different net work.

See <a href="https://stackoverflow.com/questions/41185443/nuget-connection-attempt-failed-unable-to-load-the-service-index-for-source">the same issue</a> for some more details.

blocks|key|100288|text|nuget+restore+|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|100289|和|unstyled|100290|msbuild+/t:restore|100291|两个都不适合我。但|100292|dotnet+restore+|100293|工作得很完美。试试看|100294|entityMap^0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@]|A|$B|C]]|$1|D|3|E|5|F|7|R|8|@]|9|@]|A|$]]|$1|G|3|H|5|6|7|S|8|@]|9|@]|A|$B|C]]|$1|I|3|J|5|F|7|T|8|@]|9|@]|A|$]]|$1|K|3|L|5|6|7|U|8|@]|9|@]|A|$B|C]]|$1|M|3|N|5|F|7|V|8|@]|9|@]|A|$]]|$1|O|3|-4|5|F|7|W|8|@]|9|@]|A|$]]]|P|$]]

<pre><code>nuget restore 
</code></pre>
and
<pre><code>msbuild /t:restore
</code></pre>
both didn't work for me. But
<pre><code>dotnet restore 
</code></pre>
worked perfect. Try that

blocks|key|100341|text|在Windows+7上测试|type|unstyled|depth|inlineStyleRanges|entityRanges|data|100342|Step1+:打开命令窗口(运行命令)步骤2:运行以下命令以启用TLS1.2支持(如果已禁用)(添加注册表项)：|100343|"HKLM\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\TLS+1.2\Client“/v+DisabledByDefault+/t+REG_DWORD+/d+0+/f+/reg:32+reg+add+"HKLM\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\TLS+1.2\Client”/v+DisabledByDefault+/t+REG_DWORD+/d+0+/f+/reg:64+reg+add+"HKLM\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\TLS+1.2\Client“启用了/v的/t+1Client注册表添加"HKLM\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\TLS+1.2\+/reg:32“/v+Enabled+/t+REG_DWORD+/d+1+/f+/reg:64|100344|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|H|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|I|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|J|8|@]|9|@]|A|$]]|$1|F|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|G|$]]

Tested on Windows 7
Step1 : Open Command window (run cmd) Step 2: Run the following commands to enable TLS 1.2 support if it is disabled (adding REGISTRY Entries):
&quot;HKLM\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\TLS 1.2\Client&quot; /v DisabledByDefault /t REG_DWORD /d 0 /f /reg:32 reg add &quot;HKLM\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\TLS 1.2\Client&quot; /v DisabledByDefault /t REG_DWORD /d 0 /f /reg:64 reg add &quot;HKLM\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\TLS 1.2\Client&quot; /v Enabled /t REG_DWORD /d 1 /f /reg:32 reg add &quot;HKLM\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\TLS 1.2\Client&quot; /v Enabled /t REG_DWORD /d 1 /f /reg:64

This is my NuGet.config : 

<pre class="lang-xml prettyprint-override"><code>&lt;?xml version="1.0" encoding="utf-8"?&gt;
&lt;configuration&gt;
 &lt;packageSources&gt;
 &lt;add key="nuget.org" value="https://api.nuget.org/v3/index.json" protocolVersion="3" /&gt;
 &lt;/packageSources&gt;
 &lt;disabledPackageSources&gt;
 &lt;add key="Microsoft and .NET" value="true" /&gt;
 &lt;/disabledPackageSources&gt;
&lt;/configuration&gt;
</code></pre>

Now, in Visual Studio, when I try to install 'geckofx45' package, I get the following error : 

<blockquote>
 install-package geckofx45
 install-package : Unable to load the service index for source <a href="https://api.nuget.org/v3/index.json" rel="noreferrer">https://api.nuget.org/v3/index.json</a>.
 At line:1 char:1
 + install-package geckofx45
 + ~~~~~~~~~~~~~~~~~~~~~~~~~
 + CategoryInfo : NotSpecified: (:) [Install-Package], Exception
 + FullyQualifiedErrorId : NuGetCmdletUnhandledException,NuGet.PackageManagement.PowerShellCmdlets.InstallPackageCommand
</blockquote>

Do you have any solutions ?

Thank you in advance

Visual Studio - Nuget - Unable to load the service index for source

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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这是我的NuGet.config：<?xml version="1.0" encoding="utf-8"?><configuration> <packageSources> <add key="nuget.org" value="https://api.nuget.org/v3/index.json" ...

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