有些开发环境可能既不使用浏览器也不使用代理。

一种解决方案是从nugget(例如https://dotnet.myget.org/F/dotnet-core/api/v3/index.json)下载包到共享目录，然后执行以下操作:

dotnet add package Microsoft.AspNetCore.StaticFiles -s "shared drive:\index.json"

我希望这对你有用。  

转到%appdata%\NuGet\NuGet.config 修改这一行: < packageSources > <add key="Microsoft Visual Studio Offline Packages" value="C:\Program Files (x86)\Microsoft sdk \NuGetPackages\" /> . <add key="Package source" value="https://api.nuget.org/v3/index.json" /> . < / packageSources >

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

我花了一天的时间，试遍了这里的一切。 对我来说，我没有在Visual Studio中更新我的密码!

I had changed my work Microsoft account password last week or so, I also use that account to login to visual studio, however I wasn't prompted to update it and was not logged out of Visual Studio, it remained logged in. When I clicked on my initials in the top right of visual studio > Account settings > under All Accounts the work account had yellow exclamation triangle warning sign next to it, updated the new password, then updated some packages, dotnet restore, cleaned & rebuilt and the errors are gone.

在我的情况下，我失去了与Git的连接。我只是再次添加连接，它工作!：