Downloading From Dl3 And Dl4 Servers Is Restricted By Our Data Center Work -
Many software update systems use content delivery networks (CDNs) with server names like dl3.example.com or dl4.example.com. When a data center firewall or proxy policy blocks these domains, users see an error such as:
“Downloading from dl3 and dl4 servers is restricted by our data center work.”
This article explains why this happens and how to fix it. Many software update systems use content delivery networks
Modern infrastructures use blue-green deployment. If DL3 and DL4 are part of the "blue" environment being decommissioned, traffic is restricted on those nodes while all requests are redirected to DL5 and DL6. The message is a transparent notification that those specific nodes are offline for migration.
When a service uses multiple servers (like dl1, dl2, dl3, dl4), they often use a load balancer to distribute users evenly. However, if the message specifies that only dl3 and dl4 are restricted, this implies selective traffic shaping. “Downloading from dl3 and dl4 servers is restricted
Free users are often routed to specific servers (dl3/dl4), while premium users are sent to higher-priority nodes (dl0, dl-premium). Upgrading to a paid account may instantly resolve the restriction.
Sometimes, the restriction is not about the servers themselves but the network path to them. Data center engineers may be reconfiguring BGP routing, upgrading switches, or altering firewall ACLs. During this window, they restrict downloads to prevent half-finished transfers or connection timeouts. This article explains why this happens and how to fix it
While you cannot control a data center’s workflow, you can reduce the frequency of this error: