File-hosting services and CDNs are prime targets for bandwidth abuse. Bots, download accelerators, and users who attempt to bypass download limits often target less-monitored servers like dl3 and dl4. To combat this, data centers implement rules that block or restrict downloading from those endpoints when suspicious activity is detected. Common triggers include:

The decision to restrict downloads from dl3 and dl4 is driven by three primary factors related to data center work and maintenance:

What (video, software, game) are you attempting to access?

File networks rarely rely on just two servers. The requested file likely exists on other mirrors within the same network (such as DL1, DL2, or DL5).

The message "downloading from DL3 and DL4 servers is restricted by our data center work" is typically encountered on file hosting platforms, cloud storage services, or dedicated download portals. The "DL3" and "DL4" designations refer to specific server clusters within a data center's infrastructure. These are often load-balanced download servers that handle file transfer requests from users around the world.