问错误MSB3073与代码1一起退出，无法加载源index.json的服务索引

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2>C:\Program Files\dotnet\sdk\2.2.100\NuGet.targets(114,5): error : Unable to load the service index for source https://api.nuget.org/v3/index.json. [C:\src\DockNetMicro\DockNetMicro.csproj]
2>C:\Program Files\dotnet\sdk\2.2.100\NuGet.targets(114,5): error : No such host is known [C:\src\DockNetMicro\DockNetMicro.csproj]
2>The command 'cmd /S /C dotnet restore "DockNetMicro/DockNetMicro.csproj"' returned a non-zero code: 1
2>C:\Users\rizka.hasmulyawan\.nuget\packages\microsoft.visualstudio.azure.containers.tools.targets\1.0.2105168\build\Container.targets(159,5): error MSB3073: The command "docker build -t "docknetmicro" -f "e:\work\note\netcoretest\docknetmicro\docknetmicro\dockerfile" --label "com.microsoft.created-by=visual-studio" ".."" exited with code 1.
2>Done building project "DockNetMicro.csproj" -- FAILED.

FROM microsoft/dotnet:2.2-aspnetcore-runtime-nanoserver-1803 AS base
WORKDIR /app
EXPOSE 80
EXPOSE 443

FROM microsoft/dotnet:2.2-sdk-nanoserver-1803 AS build
WORKDIR /src
COPY ["DockNetMicro/DockNetMicro.csproj", "DockNetMicro/"]
RUN dotnet restore "DockNetMicro/DockNetMicro.csproj"
COPY . .
WORKDIR "/src/DockNetMicro"
RUN dotnet build "DockNetMicro.csproj" -c Release -o /app

FROM build AS publish
RUN dotnet publish "DockNetMicro.csproj" -c Release -o /app

FROM base AS final
WORKDIR /app
COPY --from=publish /app .
ENTRYPOINT ["dotnet", "DockNetMicro.dll"]