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 InsufficientInstanceCapacity means there is not enough capacity to fulfill the EC2 instance request in the selected capacity pool.
AWS InternalError (Internal Error) means an internal Amazon S3 server error occurred while processing the request. In Amazon S3, this error returns HTTP 500.
AWS InvalidAccessKeyId (Invalid Access Key Id) means the AWS access key ID in the request does not exist in AWS records. In Amazon S3, this error returns HTTP 403.
AWS InvalidAction (Invalid Action) means the action or operation requested is invalid. In AWS APIs, this error returns HTTP 400.
AWS InvalidAddressingHeader means the request is missing or using an invalid addressing-role header; in S3 this appears with the message "You must specify the Anonymous role" (HTTP status listed as N/A).
AWS InvalidAMIID.NotFound means the specified AMI does not exist, is not visible in the selected region/account scope, or is blocked by image-allow criteria.
CloudFront returns `InvalidArgument` when one or more request parameters are invalid, so the distribution operation is rejected with HTTP 400.
AWS InvalidArgument (Invalid Argument) means one or more request arguments are invalid, missing, or in the wrong format. In Amazon S3, this error returns HTTP 400.
AWS InvalidBucketName (Invalid Bucket Name) means the specified bucket name is invalid for Amazon S3 naming rules. In Amazon S3, this error returns HTTP 400.
AWS InvalidClientTokenId (Invalid Client Token Id) means the AWS access key ID or client token does not exist in records. In AWS APIs, this error returns HTTP 403.
Amazon EC2 returns `InvalidGroup.NotFound` when the referenced security group ID or name cannot be found in the target VPC scope.
AWS InvalidInstanceID.NotFound means the specified instance ID does not exist in the current scope, or it has not fully propagated yet.
AWS InvalidKeyPair.NotFound (EC2 Invalid Key Pair Not Found) means the specified key pair does not exist in the selected region.
AWS InvalidObjectState means the requested operation is not valid for the object’s current state in S3 (HTTP 403).
CloudFront returns `InvalidOrigin` when the specified Amazon S3 origin does not refer to a valid S3 bucket in the distribution request (HTTP 400).