就我而言，我在不知情的情况下注销了我的工作账户。重新登录我的visual studio帐户解决了这个问题。

为了支持@Eddie Chen提供的答案(这里)，我不得不将http_proxy设置添加到以下文件中:

C: \ Windows \ system32 \漫游配置systemprofile \ AppData \ \鸡块鸡块。配置

<add key="http_proxy" value="http://your_proxy_url:8080" />

在我的情况下，我有Fiddler运行，改变了我的代理设置

我通过安装IISCrypto并在命令行上运行来修复这个问题:

IISCryptoCli.exe /template default /reboot

该错误可能是由临时网络问题引起的，如果重试，该错误将消失。

我在Visual Studio 2015上执行Install-Package Modernizr时遇到了类似的问题。我通过以下步骤解决了这个问题:

Download the package from its online source. Go to Tools/NuGet Package Manager/Package Manager Settings. Select Package Sources from the window. Add a new package source by clicking on the + sign. Enter a name and source location by clicking on ... (triple dot) sign. Make sure that only the package source that you've just added is checked. Uncheck all the other package sources. Go to Package Manager Console and type Install-Package Modernizr. Visual Studio 2015 installs the package automatically and creates Scripts and packages folders in your root folder.

我希望同样的解决方案在安装其他包时也能起作用。