error NU1301: Unable to load the service index for source https://api.nuget.org/v3/index.json (in VS .fsx editor or FSI)

[smoothdeveloper]

I'm facing this when using the #r "nuget: ..." FSI extension in VS or from FsiAnyCpu.exe (and likely in dotnet fsi the same):

error NU1301: Unable to load the service index for source https://api.nuget.org/v3/index.json

Repro steps

Editing a .fsx script with few #r "nuget: ...", the first one shows squiggles with this error message, which also shows in the VS status bar.

Expected behavior

In case of network error, I think it needs to gracefully attempt package resolution based on ~/.nuget/packages, and report the network issues via telemetry, and fail to the user only if the local resolution failed.

Maybe there is a way to show a warning rather than an error squiggle in such case.

It may still be allowed to fail if it can't resolve dependencies based on the local cache.

Actual behavior

Type checking really goes haywire with difficult to troubleshoot errors based on what you use (type providers) when evaluating the script or inspecting in the tooling.

Known workarounds

• manual package reference from nuget cache
• paket extension which seems to be more robust, but requires adjustments to the directives and deploying in both IDE and FSI

Related information

I never face this with machine in US, but do in Europe.

possibly related issue: NuGet/NuGetGallery#9396 (comment)

VS 2022 Version 17.7.6

.NET SDK:
 Version:   8.0.100-rc.2.23502.2
 Commit:    0abacfc2b6

Runtime Environment:
 OS Name:     Windows
 OS Version:  10.0.22621
 OS Platform: Windows
 RID:         win-x64
 Base Path:   C:\Program Files\dotnet\sdk\8.0.100-rc.2.23502.2\

.NET workloads installed:
 [maui-android]
   Installation Source: VS 17.7.34221.43
   Manifest Version:    8.0.0-rc.2.9530/8.0.100-rc.2
   Manifest Path:       C:\Program Files\dotnet\sdk-manifests\8.0.100-rc.2\microsoft.net.sdk.maui\8.0.0-rc.2.9530\WorkloadManifest.json
   Install Type:              Msi

 [android]
   Installation Source: VS 17.7.34221.43
   Manifest Version:    34.0.0-rc.2.479/8.0.100-rc.2
   Manifest Path:       C:\Program Files\dotnet\sdk-manifests\8.0.100-rc.2\microsoft.net.sdk.android\34.0.0-rc.2.479\WorkloadManifest.json
   Install Type:              Msi


Host:
  Version:      8.0.0-rc.2.23479.6
  Architecture: x64
  Commit:       0b25e38ad3

.NET SDKs installed:
  5.0.408 [C:\Program Files\dotnet\sdk]
  6.0.404 [C:\Program Files\dotnet\sdk]
  7.0.102 [C:\Program Files\dotnet\sdk]
  7.0.403 [C:\Program Files\dotnet\sdk]
  8.0.100-preview.7.23376.3 [C:\Program Files\dotnet\sdk]
  8.0.100-rc.2.23502.2 [C:\Program Files\dotnet\sdk]

.NET runtimes installed:
  Microsoft.AspNetCore.App 3.1.32 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 5.0.17 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 6.0.12 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 6.0.23 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 6.0.24 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 7.0.2 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 7.0.12 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 7.0.13 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 8.0.0-preview.7.23375.9 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 8.0.0-rc.2.23480.2 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.NETCore.App 3.1.32 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 5.0.17 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 6.0.12 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 6.0.23 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 6.0.24 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 7.0.2 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 7.0.12 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 7.0.13 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 8.0.0-preview.7.23375.6 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 8.0.0-rc.2.23479.6 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.WindowsDesktop.App 3.1.32 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
  Microsoft.WindowsDesktop.App 5.0.17 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
  Microsoft.WindowsDesktop.App 6.0.12 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
  Microsoft.WindowsDesktop.App 6.0.23 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
  Microsoft.WindowsDesktop.App 6.0.24 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
  Microsoft.WindowsDesktop.App 7.0.2 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
  Microsoft.WindowsDesktop.App 7.0.12 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
  Microsoft.WindowsDesktop.App 7.0.13 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
  Microsoft.WindowsDesktop.App 8.0.0-preview.7.23376.1 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
  Microsoft.WindowsDesktop.App 8.0.0-rc.2.23479.10 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]

Other architectures found:
  x86   [C:\Program Files (x86)\dotnet]
    registered at [HKLM\SOFTWARE\dotnet\Setup\InstalledVersions\x86\InstallLocation]

Environment variables:
  Not set

global.json file:
  Not found

Learn more:
  https://aka.ms/dotnet/info

Download .NET:
  https://aka.ms/dotnet/download

[smoothdeveloper]

Is there a way to look at what nuget.exe is doing, like a log file, or the terminal output of it?

[smoothdeveloper]

[smoothdeveloper]

and then:

no issues ever.

[smoothdeveloper]

@forki are you up for hire to help the nuget & packaging design team to push nuget forward?

[vzarytovskii]

Nothing to do with dependency manager, it uses nuget to restore packages

[smoothdeveloper]

@vzarytovskii do you recommend I post the same issue on nuget repository?

[vzarytovskii]

I think so, yes

[smoothdeveloper]

ok, makes sense; is there still a sense that the package extension could surface diagnostic in FSI output?

I believe it is shelling out to msbuild, which shells to nuget, so there could be stuff that occur and need to be printed to the user for better diagnosis.