Our AWS error library covers high-impact exceptions across S3, IAM, EC2, Lambda, and DynamoDB with service-specific diagnostics. Each entry is written for incident workflows using RequestId and HostId evidence, policy scope checks, and quota or regional constraint analysis.
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AWS TransactionConflictException means a DynamoDB transactional request conflicted with another concurrent item update (HTTP 400).
AWS Unavailable (Unavailable) means the service is temporarily unavailable. In AWS APIs, this error returns HTTP 503.
IAM returns `UnmodifiableEntity` when a protected resource, typically a service-linked role, is managed only by the owning AWS service and cannot be changed directly. IAM returns HTTP 400 for this condition.
AWS UnsupportedOperation means the requested EC2 operation is not supported for the selected instance, AMI, or resource configuration.
AWS ValidationException (Validation Exception) means the input fails service validation constraints. In AWS APIs, this error returns HTTP 400.
Amazon EC2 returns `VolumeInUse` when the specified EBS volume is attached to an instance and not in an `available` state for the requested operation.