Build Pipeline for dot net core service fails with error 401 (Unauthorized) when provided globalPackagesFolder in nuget.config

Question

Facing a strange issue in build pipeline in ADO for dot net core service.

I am trying to set a path for the packages being referred in nuget.config file. Below is nuget.config file.

    <?xml version="1.0" encoding="utf-8"?>
<configuration>
  <config>
    <add key="repositorypath" value="..\..\Packages" />
     <!--Affects projects using PackageReference only--> 
    <add key="globalPackagesFolder" value="..\..\Packages" />
    <add key="dependencyversion" value="HighestMinor" />
  </config>
  <solution>
    <add key="disableSourceControlIntegration" value="true" />
  </solution>
  <packageRestore>
    <!-- Allow NuGet to download missing packages -->
    <add key="enabled" value="True" />
    <!-- Automatically check for missing packages during build in Visual Studio -->
    <add key="automatic" value="True" />
  </packageRestore>
  <activePackageSource>
    <add key="All" value="(Aggregate source)" />
  </activePackageSource>
  <packageSources>
    <add key="NuGet Server" value="my private feed" />
    <add key="NuGet" value="https://api.nuget.org/v3/index.json" />
  </packageSources>
  <disabledPackageSources />
</configuration>

After adding below line getting 401 Unauthorised.

<add key="globalPackagesFolder" value="..\..\Packages" />

Exception

Retrying 'FindPackagesByIdAsync' for source 'myfeed/nuget/v3/flat2/microsoft.extensions.dependencyinjection/index.json'.
  Response status code does not indicate success: 401 (Unauthorized).
  Restore failed in 8.09 sec for /home/vsts/work/1/s/Service/Test/myproject.Tests/myproject.Tests.csproj.

Below are tasks in build pipeline

pool:
  vmImage: 'ubuntu-latest'

variables:
  buildConfiguration: 'Release'

steps:

- task: NuGetToolInstaller@1

- task: NuGetCommand@2
  inputs:
    #command: 'restore'
    restoreSolution: 'Service/myservice.sln'
    feedsToUse: config
    nugetConfigPath: 'Service/.nuget/nuget.config'
    externalFeedCredentials: 'MyPackages'

- script: dotnet build "Service/myservice.sln" --configuration $(buildConfiguration) -p:langversion=latest
  displayName: 'dotnet build $(buildConfiguration)'

Answer 1

Build Pipeline for dot net core service fails with error 401 (Unauthorized) when provided globalPackagesFolder in nuget.config

According to the error message:

Retrying 'FindPackagesByIdAsync' for source 'myfeed/nuget/v3/xxx'.
  Response status code does not indicate success: 401 (Unauthorized).

We could to know it is trying to access your private nuget feed and get this 401 (Unauthorized) error. It seems you did not provide certification information in the nuget.config file.

To resolve this issue, please try to add the certification information in your nuget.config as following:

  <packageSourceCredentials>
    <NuGet Server>
      <add key="Username" value="xxxxx" />
      <add key="ClearTextPassword" value="Password/PAT" />
    </NuGet Server>
  </packageSourceCredentials>

Check this thread for some more details.

Hope this helps.