This issue can occur under the following conditions:
- Traffic Manager is clustered with a pool node that is a backend Amazon Web Services (AWS) Simple Storage Server (S3) bucket.
- The pool has been configured using DNS-derived auto-scaling to ensure it uses the correct S3 IP address.
- The S3 IP address changes periodically.
If an HTTP request is being serviced at the time that the DNS-derived autoscaling is updates, the HTTP response is truncated and the end-user only receives part of the file that is downloaded.