[810086] Error compiling script (0,0): Unable to load the service index for source https://api.nuget.org/v3/index.json. (4378808)

When upgrading to version 9.3 without internet access, the following error appears at the end of the schema installation:

[810086] Error compiling script (0,0): Unable to load the service index for source https://api.nuget.org/v3/index.json.

The security policy denies any internet connection for the environment, preventing access to the NuGet package repository. 

To resolve this issue, apply hotfix 475515 using the following steps. Note that Hotfix ID 475644 is a subitem of 475515, and the fix will be referenced by the latter ID number.

Required files (Attached to this article):

• 20250207_QBM_OneIdentityManager.9.3.#475515.zip
• VI.DB.Compile.zip

Steps to apply the fix:

• Replace the VI.DB. Compile.dll File. | Extract VI.DB.Compile.zip and replace VI.DB.Compile.dll in the following locations:
  • Your Installation source directory: Modules\QBM\install\bin\
  • In the One Identity Manager client folder (where the Configuration Wizard is started from)
• Configure a Local NuGet Mirror. | Since internecc access is restricted, create a local mirror clone of NuGet packages:
  • On an online machine, perform a compilation to download the required NuGet packages.
  • Copy the downloaded NuGet packages into a local folder (e.g., C:\Temp\NuGet).
• Update the Configuration. | Modify the appsettings.json file in the One Identity Manager client folder and add the following lines inside the outer {} brackets:
  • Please note the comma sign which separates this JSON object from the previous one:

,
 "Compiler": {
     "ExternalNugetSource": "C:\\Temp\\Nuget"
 }

• Restart and Complete the Upgrade 
  • If you have started the migration, cancel it.
  •  Restart the migration, If the previous upgrade failed due to compilation, restoring from backup is not necessary).
  • The compiler will now use the local NuGet packages instead of attepting to connect to the internet.
• Import the Transport Package | Import 20250207_QBM_OneIdentityManager.9.3.#475515.zip to:
  • Add VI.DB.Compiler.dll to the database.
  • Enable automatic distribution to other IM clients via AutoUpdate
  • Create a new Configuration Parameter: Common\Compiler\ExternalNugetSource 
• Ensure other clients have access to the NuGet Mirror. 
  •  To allow other clients to compile scripts too without modifying appsettings json, ensure the NuGet mirror is accessible.
  • Define the mirror's location (e.g., a network share) in Common\Compiler\ExternalNugetSource using Designer.