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Use the control that matches the congested link. For Configuration Manager clients downloading application, update, or operating-system content over a VPN, create a targeted Configuration Manager client setting that limits BITS background transfers. For a site server sending content to a remote distribution point (DP), use the DP’s native rate-limit and schedule controls instead. BITS throttling is not an SCCM-only filter: it can also slow other background BITS jobs on the device, and it does not cap foreground traffic or the VPN tunnel as a whole.

First identify the traffic direction

Traffic Best control What it limits
Client downloading from a DP Configuration Manager BITS client setting, or Windows BITS policy BITS background transfers on targeted devices; not only Configuration Manager jobs
Site server sending content to a remote DP DP properties, Rate Limits and Schedule Content replication from the sending site to that DP
Pull DP retrieving from a source DP Controls on the pull-DP transfer path, including applicable BITS/IIS settings Pull content transfer
All traffic through a VPN tunnel VPN gateway, firewall, SD-WAN, or QoS policy The tunnel or traffic classes, regardless of application
All web traffic from an IIS site IIS/server bandwidth controls Potentially every service using that IIS site

Configuration Manager’s DP documentation distinguishes client transfers from site-server-to-DP rate limits: Microsoft’s distribution-point guidance.

What BITS throttling actually does

Background Intelligent Transfer Service (BITS) moves files over HTTP or SMB and is designed to use available or idle bandwidth. Its view is local to the device and may not reveal congestion farther away on a VPN or WAN. A fast Wi-Fi or Ethernet adapter therefore does not prove that the tunnel has spare capacity. See Microsoft’s BITS overview and network-bandwidth behavior.

  • The policy applies to BITS background transfers, not foreground transfers.
  • A limit below approximately 2 Kbps still results in roughly 2 Kbps of BITS use.
  • 0 Kbps blocks BITS background transfers during the affected period.
  • Peer-caching traffic may require a separate peer-caching policy.
  • Windows Update, security software, Microsoft Store activity, and other applications can also use BITS.

Recommended method: targeted Configuration Manager client settings

Use a custom device setting assigned to a VPN-device collection rather than changing the default client setting for every computer. Custom settings assigned to collections override the default settings; the current labels are documented in Configuration Manager client settings.

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  1. Create or verify a collection containing only the devices that should be throttled. VPN boundary membership can help identify clients, but validate that content-source selection and routing also use the intended path.
  2. In the console, open Administration → Client Settings.
  3. Create a custom client device setting, or edit an appropriately scoped setting.
  4. Select Background Intelligent Transfer Service (BITS).
  5. Enable Limit the maximum network bandwidth for BITS background transfers.
  6. Set the throttling-window start and end times, the maximum rate during the window, and whether BITS may use unused bandwidth outside it. Labels vary slightly by current-branch release.
  7. Deploy the setting to the VPN collection and allow normal policy retrieval, or trigger a policy retrieval on a test device.

The PowerShell cmdlet exposes the enablement switch -EnableBitsMaxBandwidth. Confirm the parameter set in the installed module before scripting additional rate or schedule arguments: Set-CMClientSetting.

Windows Group Policy alternative

For domain-managed devices, the administrative-template path is Computer Configuration → Administrative Templates → Network → Background Intelligent Transfer Service. Configure Limit the maximum network bandwidth for BITS background transfers for the relevant work and non-work periods, as supported by the template.

GPO is useful when the rule must exist independently of Configuration Manager. It is broader, however: it affects BITS jobs from other software and can conflict with Configuration Manager client settings, Intune policy, or local policy. Assign it to a VPN-specific device group rather than the whole domain unless that wider scope is intentional. Microsoft’s policy behavior is described at BITS Group Policies.

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Choosing a rate without a magic number

No universal Kbps value exists. Base the limit on usable VPN capacity, expected concurrency, business-hours traffic, deployment deadlines, and whether a gateway already enforces QoS. As a planning illustration, a 20 Mbps usable link divided among 40 simultaneous clients gives a theoretical 500 Kbps per client:

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20,000 Kbps ÷ 40 clients = 500 Kbps per client

That is only a starting ceiling; protocol overhead and uneven demand require testing. Possible test values—not Microsoft defaults—are:

Scenario Illustrative starting point
Very constrained individual connection 128–256 Kbps
Moderate remote-client restriction 512 Kbps–1 Mbps
Deployment blackout period 0 Kbps, only when delaying content is acceptable
After-hours window Higher limit or unrestricted BITS use

A 0-Kbps period does not permanently fail a deployment. BITS jobs can enter a transient BG_E_BLOCKED_BY_POLICY state and return to queued behavior when the restriction ends, but the deployment may remain pending and miss a deadline.

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Server-side IIS bandwidth setting: use cautiously

An HTMD procedure changes IIS on the server hosting the DP: open IIS Manager, select Default Web Site, open Advanced Settings, and review Maximum Bandwidth (Bytes). The article records 4294967295 bytes (about 4.3 GB) as a lab value and suggests changing it to suit requirements: HTMD’s procedure.

This is not a per-client, per-package, or Configuration Manager-aware throttle. Its practical scope depends on IIS version, bindings, and every role hosted by that site, so it may affect unrelated web traffic. Record the existing value, test on a non-production DP, monitor downloads and IIS health, and prepare a rollback before changing it.

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Rate-limit site-server-to-DP replication

If the WAN is saturated while a site server populates a remote DP, edit the already-installed DP:

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  1. Open Administration → Distribution Points.
  2. Edit the remote DP and open Rate Limits.
  3. Choose Unlimited, Pulse mode, or an hourly maximum transfer rate.
  4. Use Schedule when transfers must occur only at selected times.

Pulse mode controls block size and delay. The hourly maximum-rate option controls the percentage of time Configuration Manager transmits; it does not measure real-time available bandwidth. Schedules use the sending site’s time zone. These controls do not automatically throttle clients downloading from that DP. Details: Microsoft’s DP installation and configuration documentation.

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Validate the change

  • Confirm the test device received the custom client setting and that the intended collection contains no unintended members.
  • Inspect effective BITS policy and active BITS jobs.
  • Review relevant client logs, including PolicyAgent.log, DataTransferService.log, ContentTransferManager.log, CAS.log, and, where applicable, LocationServices.log.
  • Compare VPN-gateway or firewall utilization before and after the policy.
  • Test during the throttle window and outside it, including a deployment with a known content size.

No single log proves every transfer path. Combine policy state, job behavior, Configuration Manager status, and network telemetry.

Troubleshooting branches

Content remains stuck

Check whether the device is inside a 0-Kbps window, whether the job is policy-blocked, and whether a deployment deadline conflicts with the schedule. Temporarily raise the limit or end the window on a test collection, then monitor the job returning to queued and transferring.

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The policy appears absent

Force or await client policy retrieval, verify collection membership, and inspect effective settings. Check for precedence or conflict among Configuration Manager, GPO, Intune Policy CSP, local policy, and VPN software.

VPN utilization does not fall

Confirm that the congested traffic is BITS background traffic. Split tunneling, foreground transfers, peer caching, cloud content, or unrelated applications may use a different path. Validate the VPN boundary and content location rather than assuming boundary membership controls both.

Remote DP replication is still saturating the WAN

A client throttle cannot fix site-server-to-DP replication. Configure the DP’s Rate Limits and Schedule, checking the sending site’s time zone.

When throttling is not the best optimization

Reducing BITS rate protects interactive traffic but can lengthen installations and create backlogs. Consider cloud-based content sources for remote workers, prestaged content for large deployments, BranchCache or carefully governed peer downloads, smaller deployment payloads, and network QoS for whole-tunnel protection. Cloud-source and remote-worker considerations are discussed at HTMD’s remote-worker optimization guidance. For VPN-boundary context, see HTMD’s VPN boundary guide.

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Large estates that need automated peer distribution and end-to-end bandwidth management may evaluate 1E Nomad (official product page), but it adds agent, architecture, governance, and licensing overhead. Native Configuration Manager, Windows, Intune, and network controls should be assessed first.

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