How to fix internal server error 500 for kusto db using user managed identity ?

Question

Hi ,

     I am trying to use user assigned managed identity to connect with KUSTO db but getting internal server error 500 . kusto db already given the permissions to my managed identity .

I am concern about the app service environment variable is that playing any role ?

Your support much appreciated. Thanks you

Answer 1

Hello SohamPrasad, To resolve a 500 Internal Server Error when connecting to Kusto DB with a User Assigned Managed Identity, here are some key areas to check:

• Verify Permissions for Managed Identity
  Ensure that your User Assigned Managed Identity (UAMI) has the correct permissions on the Kusto database. The managed identity should typically have the Database User role or a role with read/write access. You can check and assign roles in Kusto Database > Access control (IAM).
• Configure Environment Variables in App Service
  Make sure the App Service environment variables are correctly configured. Set the following:
  AZURE_CLIENT_ID: Set this to the Client ID of your User Assigned Managed Identity. This tells the App Service which managed identity to use when connecting to Kusto DB. To set environment variables, go to App Service > Settings > Configuration in the Azure Portal, and add AZURE_CLIENT_ID under Application settings.
• Verify Code Configuration for Managed Identity Authentication
  Ensure your code uses the Azure Identity SDK to authenticate with the managed identity, using AZURE_CLIENT_ID to specify the correct identity:

     from azure.kusto.data import KustoConnectionStringBuilder
     from azure.identity import ManagedIdentityCredential
  
     credential = ManagedIdentityCredential(client_id="YOUR_MANAGED_IDENTITY_CLIENT_ID")
     kcsb = KustoConnectionStringBuilder.with_aad_managed_identity("https://<your-cluster-name>.<region>.kusto.windows.net", credential=credential)
  

  Replace "YOUR_MANAGED_IDENTITY_CLIENT_ID" with your actual client ID, and "<your-cluster-name>.<region>.kusto.windows.net" with your Kusto cluster endpoint.
• Check Diagnostic Logs
  Enable Diagnostic Logs in your App Service to review any error messages:
  Go to App Service > Monitoring > App Service Logs and enable Application Logging (Filesystem).

References

• Assign Azure Roles to Managed Identities
• Azure Identity Client Library
• Kusto Python SDK

If the information helped address your question, please Accept the answer.

Luis

Answer 2

Hello SohamPrasad,

welcome to this moderated Azure community forum.

Please check out the excellent answer from @Luis Arias.

I add an extra answer because there are multiple ways of connecting to ADX programmatically.

Check out this blog post with more details.

---

If the response helped, do "Accept Answer". If it doesn't work, please let us know the progress. All community members with similar issues will benefit by doing so. Your contribution is highly appreciated.