Box: [Medium] Issues with Uploads and Downloads
Box reported major impact to uploads and downloads across its API and web application, with errors and slowness affecting customers. The incident ran from 2026-08-04 20:23 UTC to 2026-08-04 20:44 UTC (21 min). Box attributed upload failures and delays to frontend load-balancer routing and restored service by rerouting upload traffic and provisioning additional capacity.
Machine-written from the archived incident (Sol). Check the timeline before relying on it.
Affected components: Box Platform / API - Uploads/DownloadsUploads/DownloadsBox Web Application - Uploads/DownloadsUploads/Downloads
Timeline of updates
- investigating
Our team is investigating an issue with Uploads and Downloads in Box. Users may see errors or slowness when attempting to upload or download items. We will provide additional information as it becomes available.
- resolved
Our team has taken steps to remediate this issue and the uploads and downloads service has returned to full functionality. If you continue to experience any issues, please contact Box Support at https://support.box.com.
- postmortem
On August 4, 2026 between 12:10 PM PDT and 1:20 PM PDT, some customers experienced failures and delays when uploading files to Box. The problem was caused by a routing issue on our frontend load balancers. We restored service by rerouting upload traffic and provisioning additional capacity. # Analysis A temporary network connectivity disruption impacted a small part of our load balancing fleet, causing a spike of TCP retransmit errors. Our engineering team mitigated the impact by redirecting traffic away from the affected region, which restored normal upload operations and resolved the errors. This incident highlighted opportunities to improve observable signals and alerting for TCP retransmit errors. # Corrective Actions Box has initiated the following corrective actions: * Improve monitoring and alerting for the isolated TCP retransmit issues. * Review and update operational runbooks for isolating problematic instances and for capacity management to shorten time to mitigation. We are continuously working to improve Box and want to make sure we are delivering the best product and user experience we can. We hope we have provided some clarity here and we would be happy to answer any questions you may still have regarding this matter. Sincerely, The Box Team
Rewindex changes for this incident
- Major incident: [Medium] Issues with Uploads and Downloads 2026-08-04 20:23 UTC
Impact, status and times are the vendor’s own, as last archived. View on stspg.io (opens in new tab). Box profile · Recent Box incidents · Markdown · JSON