amazon-web-servicesamazon-ec2command-line-interfaceamazon-iamrole

AWS CLI in Windows EC2 cannot use role to access S3

I am very new to AWS. I created an IAM role which has full access to S3. I assigned this role to a Windows Server EC2 instance. I then installed CLI on that instance. I then remoted into that instance using RDP, and started a CMD windows, and typed in 

aws s3 ls

It complained that 

Unable to locate credentials. You can configure credentials by running "aws configure".

Now that this EC2 has been assigned the role that has full access to S3, why can't I directly access S3?

Solution

  • Thank you John Rotenstein for your help. You pointed me to the right direction. I created a new instance from scratch, and everything worked. The previous instance I installed IIS and ASP.NET on it. Would it be possibly the reason?