Unable to connect to Azure DataLake Storage gen 1, forbidden error

Question

I am using .net4.8. I need to connect to Azure Data Lake Storage Gen1.

I found below sample on github: https://github.com/Azure-Samples/data-lake-store-adls-dot-net-get-started/

Now in Azure account :

Registered New Application, got Application Id, tenantId, Client secret

// Obtain AAD token
        var creds = new ClientCredential(applicationId, clientSecret);
        var clientCreds = ApplicationTokenProvider.LoginSilentAsync(tenantId, creds).GetAwaiter().GetResult();

        // Create ADLS client object
        AdlsClient client = AdlsClient.CreateClient(adlsAccountFQDN, clientCreds);

        try
        {
            string fileName = "/test/xyz.txt";


            //Read file contents
            using (var readStream = new StreamReader(client.GetReadStream(fileName)))
            {
                string line;
                while ((line = readStream.ReadLine()) != null)
                {
                    Console.WriteLine(line);
                }
            }





        }

Line using (var readStream = new StreamReader(client.GetReadStream(fileName))) { throws an exception:

xyz.txt is both available at root as well as within /test/xyz.txt.

How to fix this exception?

Answer 1

This is clearly an permission issue. Have you added you application to access your data lake as per the below screenshot, this is mandatory to have service to service authentication.

Please make sure to check the below thread to ensure you have the right privilege:

https://learn.microsoft.com/en-us/azure/data-lake-store/data-lake-store-service-to-service-authenticate-using-active-directory

It worked for me. Try this and see if it helps else will take a look and debug with you.