blocks|key|2010851|text|我已经使用Visual和NuGet很长时间了，几天前NuGet也在工作。有人能弄清楚为什么会发生这种事吗?我能做些什么来解决这个问题？|type|blockquote|depth|inlineStyleRanges|entityRanges|data|2010852|这个问题可能与网络、nuget缓存冲突甚至nuget代理有关。因此，有许多因素可能导致这一问题。经过我的研究，很多用户都面临着和你一样的问题。若要排除故障，请遵照我的建议：|unstyled|2010853|建议|offset|length|style|BOLD|2010854|清理nuget缓存消除高速缓存干扰。|ordered-list-item|2010855|选择可用的包source(Tools-->Options-->Nuget包管理器->+package+)并添加一个新的源链接，如http://packages.nuget.org/v1/FeedService.svc/。在这一点上，更改一个服务点来检查网络是否干扰了以前的服务链路。|CODE|2010856|尝试将代理设置添加到Nuget.Config文件中。有关详细信息，请参阅此链接：Nuget+Config科+&+Nuget代理设置。|2010857|更多信息，您可以参考这。|2010858|另外，如果VS2019不是最新版本，请将其更新为最新版本。|2010859|如果您的问题仍然存在，请随时通知我们。|2010860|entityMap|0|LINK|mutability|MUTABLE|url|https://learn.microsoft.com/en-us/nuget/consume-packages/managing-the-global-packages-and-cache-folders#clearing-local-folders|1|https://learn.microsoft.com/en-us/nuget/reference/nuget-config-file#config-section|2|http://skolima.blogspot.com/2012/07/nuget-proxy-settings.html|3|https://stackoverflow.com/questions/41185443/nuget-connection-attempt-failed-unable-to-load-the-service-index-for-source^0|0|0|0|2|0|0|9|0|0|1S|19|0|14|D|1|1K|9|2|0|A|1|3|0|0|3|0|0^^$0|@$1|2|3|4|5|6|7|1C|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|1D|8|@]|9|@]|A|$]]|$1|E|3|F|5|D|7|1E|8|@$G|1F|H|1G|I|J]]|9|@]|A|$]]|$1|K|3|L|5|M|7|1H|8|@]|9|@$G|1I|H|1J|1|1K]]|A|$]]|$1|N|3|O|5|M|7|1L|8|@$G|1M|H|1N|I|P]]|9|@]|A|$]]|$1|Q|3|R|5|M|7|1O|8|@]|9|@$G|1P|H|1Q|1|1R]|$G|1S|H|1T|1|1U]]|A|$]]|$1|S|3|T|5|D|7|1V|8|@]|9|@$G|1W|H|1X|1|1Y]]|A|$]]|$1|U|3|V|5|D|7|1Z|8|@$G|20|H|21|I|J]]|9|@]|A|$]]|$1|W|3|X|5|D|7|22|8|@]|9|@]|A|$]]|$1|Y|3|-4|5|D|7|23|8|@]|9|@]|A|$]]]|Z|$10|$5|11|12|13|A|$14|15]]|16|$5|11|12|13|A|$14|17]]|18|$5|11|12|13|A|$14|19]]|1A|$5|11|12|13|A|$14|1B]]]]

<blockquote>
 I have been using Visual Studio and NuGet for a long time and NuGet
 was working a few days ago. Can someone figure out why this is
 happening and what I can do to solve it?
</blockquote>

The issue could be more related to network, nuget cache conflicts or even nuget agent. So there are a number of factors that can contribute to this problem. After my research, many users are facing the same problem as yours. To troubleshoot it, please follow my suggestions:

Suggestions

<ol>
<li><a href="https://learn.microsoft.com/en-us/nuget/consume-packages/managing-the-global-packages-and-cache-folders#clearing-local-folders" rel="nofollow noreferrer">clean the nuget cache</a>to eliminate cache interference.</li>
<li>select Available package source(Tools-->Options-->Nuget Package Manager-->Package Source) and add a new source link like <code>http://packages.nuget.org/v1/FeedService.svc/</code>. In this point, change a service point to check whether the network interference the previous service link.</li>
<li>try to add proxy settings into Nuget.Config file. Refer to this link for details: <a href="https://learn.microsoft.com/en-us/nuget/reference/nuget-config-file#config-section" rel="nofollow noreferrer">Nuget Config Section</a> &amp; <a href="http://skolima.blogspot.com/2012/07/nuget-proxy-settings.html" rel="nofollow noreferrer">Nuget Proxy Settings</a>. </li>
</ol>

More information you can refer to <a href="https://stackoverflow.com/questions/41185443/nuget-connection-attempt-failed-unable-to-load-the-service-index-for-source">this</a>.

In addition, if VS2019 is not the latest version, please update it to the latest version.

If your issue still persists, please feel free to let us know.

blocks|key|1167848|text|我也遇到了同样的问题，我的解决方案是“下载并将证书添加到Windows证书管理器”|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1167849|Certmgr.msc|ordered-list-item|1167850|在本地计算机->可信根证书颁发机构中导入证书|1167851|重新启动|1167852|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$]]|$1|E|3|F|5|D|7|M|8|@]|9|@]|A|$]]|$1|G|3|H|5|D|7|N|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|O|8|@]|9|@]|A|$]]]|J|$]]

I had same problem and my solution is "Download and add certificate to Windows Certificate Manager"

<ol>
<li>Certmgr.msc</li>
<li>Import certificate in Local Computer -> Trusted root certificate authorities</li>
<li>Reboot</li>
</ol>

<hr>

blocks|key|1167896|text|NuGet有永久删除对TLS+1.0和1.1的支持。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1167897|确保系统使用TLS+1.2。|1167898|如果TLS+1.2被禁用，请运行以下命令以启用它的支持：|1167899|reg+add+"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"+/v+Enabled+/t+REG_DWORD+/d+1+/f+/reg:32
reg+add+"HKLM\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\TLS+1.2\Client"+/v+Enabled+/t+REG_DWORD+/d+1+/f+/reg:64|code-block|syntax|javascript|1167900|entityMap|0|LINK|mutability|MUTABLE|url|https://devblogs.microsoft.com/nuget/nuget-org-will-permanently-remove-support-for-tls-1-0-and-1-1-on-june-15th/|1|https://devblogs.microsoft.com/nuget/deprecating-tls-1-0-and-1-1-on-nuget-org/^0|6|J|0|0|0|D|1|0|0|0^^$0|@$1|2|3|4|5|6|7|W|8|@]|9|@$A|X|B|Y|1|Z]]|C|$]]|$1|D|3|E|5|6|7|10|8|@]|9|@$A|11|B|12|1|13]]|C|$]]|$1|F|3|G|5|6|7|14|8|@]|9|@]|C|$]]|$1|H|3|I|5|J|7|15|8|@]|9|@]|C|$K|L]]|$1|M|3|-4|5|6|7|16|8|@]|9|@]|C|$]]]|N|$O|$5|P|Q|R|C|$S|T]]|U|$5|P|Q|R|C|$S|V]]]]

NuGet has <a href="https://devblogs.microsoft.com/nuget/nuget-org-will-permanently-remove-support-for-tls-1-0-and-1-1-on-june-15th/" rel="noreferrer">permanently removed support for TLS 1.0 and 1.1</a>.
<a href="https://devblogs.microsoft.com/nuget/deprecating-tls-1-0-and-1-1-on-nuget-org/" rel="noreferrer">Ensure your system uses TLS 1.2</a>.
Run the following commands to enable TLS 1.2 support if it is disabled:
<pre><code>reg add &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
</code></pre>

blocks|key|2010948|text|我使用的是TLS1.2，但缺少一个兼容的密码套件。您可以测试哪些TLS和ciphers+nuget使用via：https://www.ssllabs.com/ssltest/analyze.html?d=api.nuget.org，还可以测试在主机via上安装了哪些密码(但不一定启用)：Get-TlsCipherSuite或-Path+-Name函数。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|2010949|entityMap|0|LINK|mutability|MUTABLE|url|https://www.ssllabs.com/ssltest/analyze.html?d=api.nuget.org^0|1J|1O|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@$A|M|B|N|1|O]]|C|$]]|$1|D|3|-4|5|6|7|P|8|@]|9|@]|C|$]]]|E|$F|$5|G|H|I|C|$J|K]]]]

I was using TLS1.2 but missing a compatible cipher suite.
You can test what TLS and ciphers nuget use via: <a href="https://www.ssllabs.com/ssltest/analyze.html?d=api.nuget.org" rel="nofollow noreferrer">https://www.ssllabs.com/ssltest/analyze.html?d=api.nuget.org</a>
and you can test what ciphers you have installed (but no necessarily enabled) on your host via:
Get-TlsCipherSuite
or
Get-ItemPropertyValue -Path HKLM:\SYSTEM\CurrentControlSet\Control\Cryptography\Configuration\Local\SSL\00010002 -Name Functions

When I press on "Browse" tab on NuGet packages in Visual Studio, it says "Error occurred" with an error message of

<pre><code>[nuget.org] Unable to load the service index for source https://api.nuget.org/v3/index.json.
 An error occurred while sending the request.
 The request was aborted: Could not create SSL/TLS secure channel.
</code></pre>

I have been using Visual Studio and NuGet for a long time and NuGet was working a few days ago. Can someone figure out why this is happening and what I can do to solve it?

Visual Studio 2017 version: 15.9.17

Could not create SSL/TLS secure channel while trying to search for NuGet packages

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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当我按下Visual中NuGet包上的“浏览”选项卡时，它会说“错误发生了”，错误消息为[nuget.org] Unable to load the service index for source https://api.nuget.org/v3/index.json.  An error occurred whil...

问无法在搜索NuGet包时创建SSL/TLS安全通道
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