AWS Secret Value - C# .NET Framework 4.8 - Unable to get IAM security credentials from EC2 Instance Metadata Service

Question

Hello, 
I'm trying to retrieve AWS Secret Value inside my .NET C# (.NET Framework 4.8) Application hosted on IIS in a EC2 instance like in the example showed here:
 https://docs.aws.amazon.com/secretsmanager/latest/userguide/retrieving-secrets_cache-net.html

The exception I receive is the following:
Exception Details: Amazon.Runtime.AmazonServiceException: Unable to get IAM security credentials from EC2 Instance Metadata Service.

If I try to execute the command from CLI, the secret's are retrieved successfully.

Can someone help please ?

Answer

The following GitHub and Stack Overflow sites describe similar errors and may be helpful. [1] [2]

[1] How to troubleshoot "Unable to get IAM security credentials from EC2 Instance Metadata Service."? · Issue #1699 · aws/aws-sdk-net  
https://github.com/aws/aws-sdk-net/issues/1699

[2] .net - AWS DotNet SDK Error: Unable to get IAM security credentials from EC2 Instance Metadata Service - Stack Overflow  
https://stackoverflow.com/questions/60815037/aws-dotnet-sdk-error-unable-to-get-iam-security-credentials-from-ec2-instance-m

AWS Secret Value - C# .NET Framework 4.8 - Unable to get IAM security credentials from EC2 Instance Metadata Service

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