failed to download .net core debugger

[Spongman]

Type: Bug

Issue Description

the c# dev kit apparently requires pre-release version of this extension nowm (microsoft/vscode-dotnettools#2621). so i switched to ms-dotnettools.csharp-2.0.251, and now i get this in the output window:

Installing C# dependencies...
Platform: linux, x86_64, name=rocky, version=9.4

Downloading package '.NET Core Debugger (linux / x64)' Failed to download from https://vsdebugger.azureedge.net/coreclr-debug-2-0-2/coreclr-debug-linux-x64.zip. Error code '409')
Failed at stage: downloadPackage
409

[Error - 8:07:11 PM] Microsoft.CodeAnalysis.LanguageServer client: couldn't create connection to server.

trying myself:

$ wget https://vsdebugger.azureedge.net/coreclr-debug-2-0-2/coreclr-debug-linux-x64.zip
--2025-12-16 20:07:35--  https://vsdebugger.azureedge.net/coreclr-debug-2-0-2/coreclr-debug-linux-x64.zip
Resolving vsdebugger.azureedge.net (vsdebugger.azureedge.net)... 2620:1ec:bdf::66, 2620:1ec:46::66, 13.107.246.66, ...
Connecting to vsdebugger.azureedge.net (vsdebugger.azureedge.net)|2620:1ec:bdf::66|:443... connected.
HTTP request sent, awaiting response... 409 Public access is not permitted on this storage account.
2025-12-16 20:07:35 ERROR 409: Public access is not permitted on this storage account..

Steps to Reproduce

switch to pre-release

Expected Behavior

Actual Behavior

Logs

C# log

Details

Post the output from Output-->C# here

C# LSP Trace Logs

Details

Post the output from Output-->C# LSP Trace Logs here. Requires `dotnet.server.trace` to be set to `Trace`

Environment information

VSCode version: 1.103.1
C# Extension: 2.0.251
Using OmniSharp: false

Dotnet Information

Cannot find language server in path '/home/piersh/.vscode-server/extensions/ms-dotnettools.csharp-2.0.251/.roslyn/Microsoft.CodeAnalysis.LanguageServer'

Visual Studio Code Extensions

Extension	Author	Version	Folder Name
autoscrolldown	foxx1337	1.2.1	foxx1337.autoscrolldown-1.2.1
command-variable	rioj7	1.68.0	rioj7.command-variable-1.68.0
csdevkit	ms-dotnettools	1.90.2	ms-dotnettools.csdevkit-1.90.2-linux-x64
csharp	ms-dotnettools	2.0.251	ms-dotnettools.csharp-2.0.251
edit-with-shell	ryu1kn	1.3.0	ryu1kn.edit-with-shell-1.3.0
EditorConfig	EditorConfig	0.17.4	editorconfig.editorconfig-0.17.4
gitlens	eamodio	17.7.1	eamodio.gitlens-17.7.1
tasks-shell-input	augustocdias	1.19.1	augustocdias.tasks-shell-input-1.19.1
vscode-dotnet-runtime	ms-dotnettools	3.0.0	ms-dotnettools.vscode-dotnet-runtime-3.0.0

Extension version: 2.0.251
VS Code version: Code 1.103.1 (360a4e4fd251bfce169a4ddf857c7d25d1ad40da, 2025-08-12T16:25:40.542Z)
OS version: Windows_NT x64 10.0.26200
Modes:
Connection to 'wsl+rocky9' could not be established
Remote OS version: Linux x64 6.6.87.2-microsoft-standard-WSL2
Remote OS version: Linux x64 6.6.87.2-microsoft-standard-WSL2
Remote OS version: Linux x64 6.6.87.2-microsoft-standard-WSL2
Remote OS version: Linux x64 6.6.87.2-microsoft-standard-WSL2

System Info

Item	Value
CPUs	12th Gen Intel(R) Core(TM) i9-12900HK (20 x 2918)
GPU Status	2d_canvas: enabled direct_rendering_display_compositor: disabled_off_ok gpu_compositing: enabled multiple_raster_threads: enabled_on opengl: enabled_on rasterization: enabled raw_draw: disabled_off_ok skia_graphite: disabled_off trees_in_viz: disabled_off video_decode: enabled video_encode: enabled vulkan: disabled_off webgl: enabled webgl2: enabled webgpu: enabled webnn: disabled_off
Load (avg)	undefined
Memory (System)	31.68GB (12.27GB free)
Process Argv
Screen Reader	no
VM	0%

Connection to 'wsl+rocky9' could not be established

Item	Value
Remote	WSL: Rocky9
OS	Linux x64 6.6.87.2-microsoft-standard-WSL2
CPUs	12th Gen Intel(R) Core(TM) i9-12900HK (20 x 0)
Memory (System)	29.37GB (24.89GB free)
VM	0%

Item	Value
Remote	WSL: Rocky9
OS	Linux x64 6.6.87.2-microsoft-standard-WSL2
CPUs	12th Gen Intel(R) Core(TM) i9-12900HK (20 x 0)
Memory (System)	29.37GB (24.89GB free)
VM	0%

Item	Value
Remote	WSL: Rocky9
OS	Linux x64 6.6.87.2-microsoft-standard-WSL2
CPUs	12th Gen Intel(R) Core(TM) i9-12900HK (20 x 0)
Memory (System)	29.37GB (24.89GB free)
VM	0%

Item	Value
Remote	WSL: Rocky9
OS	Linux x64 6.6.87.2-microsoft-standard-WSL2
CPUs	12th Gen Intel(R) Core(TM) i9-12900HK (20 x 0)
Memory (System)	29.37GB (24.89GB free)
VM	0%

[JoeRobich]

ms-dotnettools.csharp-2.0.251

This is an incredibly old version (maybe from July 2023). It is likely those CDN links are no longer valid. Please try updating to the latest pre-release v2.111.2.

[Spongman]

i have 'auto-update' selected in the extensions window, and i have tried uninstalling and re-installing both extensions. why is it installing an old version?

yeah, i just did it again. i uninstall both c# extensions:

i click the 'install' button there on 'c# dev kit'

it installs both extensions, and the version of this extension that's installed is 1.23.16:

the fact that it's installing an ancient version of this extension is clearly a bug.

[dibarbet]

Yeah those definitely seem like the wrong versions of both C#DK and C# that are getting installed (C#DK is on 1.91.6, C# is on 2.111.2). Definitely looks like a VSCode side bug, as we don't control which version of the C# extension gets installed. Would need to file an issue over here - https://github.com/microsoft/vscode/issues

I am curious, if you install a specific version (right click, install specific version), does it allow you to install a newer one?

[JoeRobich]

VSCode version: 1.103.1

@Spongman You will need to update VS Code as well to use the latest C# extension builds as we require 1.106 as a minimum.