你的一个金块来源可能无法到达。

在撰写本文时，AspNetCore (https://dotnet.myget.org/F/aspnetcore-dev/api/v3/index.json)似乎有一个过期的证书或已被完全删除。

只需从设置中删除nuget源就可以解决这个问题

nuget restore 

and

msbuild /t:restore

两者都没有为我工作，因为同样的错误。但

dotnet restore 

完美的工作。试试

去

设置(PC全局设置)>网络和Internet >代理>自动代理设置>和“自动检测设置”设置为“关闭”。

如果您看到如下错误，您可能需要设置Azure Artifacts凭据，请参阅Github链接，您可以通过运行powershell脚本或手动安装凭据提供程序。

error :   Response status code does not indicate success: 401 (Unauthorized).

I had the same error message while scaffolding Identity to my ASP.NET Core MVC project. Since my connection was not behind a proxy, removing/editing proxy configurations didn't make sense. And I didn't want to delete a file or uninstall PMC either. While looking around I realized a "Clear All Nuget Cache(s)" button on Tools --> Options --> NuGet Package Manager --> General. After pressing the button I had to wait for some time for the operation to complete. After that I tried to scaffold the Identity again but it didn't work. Then I decided to restart VS and voila :)

在我的例子中，我只是重新启动docker并工作。