ec2-consistent-snapshot cannot validate provided access credentials

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http://serverfault.com – I'm trying to use Eric Hammond's ec2-consistent-snapshot utility on a dedicated mysql server. I've created an IAM user and attached a power user permission policy (using the AWS console). On a 32bit Ubuntu 10.10 ec2 instance and an XFS volume, I have installed ec2-consistent-snapshot following these instructions : http://alestic.com/mt/mt-search.cgi?blog_id=1&tag=ec2-consistent-snapsho.... The command I launch is the following : ec2-consistent-snapshot \ --freeze-filesystem /data03 \ --description "Test description $(date +'%Y-%m-%d %H:%M:%S')" \ --mysql \ (HowTos)