Unable to load the service index for source

Question

I am running into an unauthorized error on an onpremise Devops 2019 build server for a .net core 3.1 solution. It seems the build server cannot access the artifact feed although this works for other solutions. Here is the error:

Active code page: 65001
[command]"C:\Program Files\dotnet\dotnet.exe" test C:\a\_work\61\s\MySolution\MySolution.csproj --logger trx --results-directory C:\a\_work\_temp
C:\Program Files\dotnet\sdk\3.1.302\NuGet.targets(128,5): error : Unable to load the service index for source https://mydomin/tfs/DefaultCollection/_packaging/MyFeed/nuget/v3/index.json. [C:\a\_work\61\MySolution\MySolution.csproj]
C:\Program Files\dotnet\sdk\3.1.302\NuGet.targets(128,5): error :   Response status code does not indicate success: 401 (Unauthorized). [C:\a\_work\61\s\MySolution\MySolution.csproj]

and here is the pipeline.yaml file, the error occurs in the DotNetCoreCLI@2 step:

# ASP.NET Core (.NET Framework)
# Build and test ASP.NET Core projects targeting the full .NET Framework.
# Add steps that publish symbols, save build artifacts, and more:
# https://learn.microsoft.com/azure/devops/pipelines/languages/dotnet-core

trigger:
- master

pool: 'Default'

variables:
  solution: '**/*.sln'
  buildPlatform: 'Any CPU'
  buildConfiguration: 'Release'

steps:
- task: NuGetToolInstaller@1
  inputs:
    versionSpec: '5.x'

- task: NuGetCommand@2
  inputs:
    restoreSolution: '$(solution)'

- task: VSBuild@1
  inputs:
    solution: '$(solution)'
    msbuildArgs: '/p:DeployOnBuild=true /p:WebPublishMethod=Package /p:PackageAsSingleFile=true /p:SkipInvalidConfigurations=true /p:DesktopBuildPackageLocation="$(build.artifactStagingDirectory)\WebApp.zip" /p:DeployIisAppPath="Default Web Site"'
    platform: '$(buildPlatform)'
    configuration: '$(buildConfiguration)'

- task: DotNetCoreCLI@2
  inputs:
    command: 'publish'
    publishWebProjects: true
    arguments: '--configuration $(buildConfiguration) --self-contained true  -f netcoreapp3.1 -r win10-x64 --output $(Build.ArtifactStagingDirectory)' 

- task: PublishBuildArtifacts@1
  inputs:
    PathtoPublish: '$(Build.ArtifactStagingDirectory)'
    ArtifactName: 'drop'
    publishLocation: 'Container'

Any suggestions how to fix the auth problem?

I tried updating the PAT token for the artifact feed on the build server but without success. Here is the full error message:

##[section]Starting: DotNetCoreCLI
==============================================================================
Task         : .NET Core
Description  : Build, test, package, or publish a dotnet application, or run a custom dotnet command
Version      : 2.153.3
Author       : Microsoft Corporation
Help         : https://learn.microsoft.com/azure/devops/pipelines/tasks/build/dotnet-core-cli
==============================================================================
[command]C:\Windows\system32\chcp.com 65001
Active code page: 65001
[command]"C:\Program Files\dotnet\dotnet.exe" publish C:\a\_work\588\s\MySolution.sln --configuration Release --self-contained true -f netcoreapp3.1 -r win10-x64 --output C:\a\_work\588\a\s
Microsoft (R) Build Engine version 16.5.0+d4cbfca49 for .NET Core
Copyright (C) Microsoft Corporation. All rights reserved.

  Restore completed in 292,84 ms for C:\a\_work\588\s\MySolution\MySolution.csproj.
C:\Program Files\dotnet\sdk\3.1.201\NuGet.targets(124,5): error : Unable to load the service index for source https://MyDomain/tfs/DefaultCollection/_packaging/MyFeed/nuget/v3/index.json. [C:\a\_work\588\s\MySolution.sln]
C:\Program Files\dotnet\sdk\3.1.201\NuGet.targets(124,5): error :   Response status code does not indicate success: 401 (Unauthorized). [C:\a\_work\588\s\MySolution.sln]
##[error]Error: The process 'C:\Program Files\dotnet\dotnet.exe' failed with exit code 1
##[error]Dotnet command failed with non-zero exit code on the following projects : C:\a\_work\588\s\MySolution.sln
##[section]Finishing: DotNetCoreCLI

Answer 1

Please try to create a PAT in DevOps, and register package feed with personal access token via the command below:

nuget sources add -name {your feed name} -source {your feed URL} -username {anything} -password {your PAT}