💡 Our Technical Review in summary
Starting with Chrome version 146, Chromium-based browsers will enforce stricter Local Network Access (LNA) restrictions. These security changes directly impact Microsoft eCDN’s ability to facilitate peer-to-peer (P2P) peering across local networks. To ensure that video traffic continues to be optimized and shared between clients rather than being pulled individually from the internet, administrators must explicitly allow eCDN URLs through browser management policies.
#### Impact
Failure to configure the required policies will result in the following:
- P2P Functionality Loss: Microsoft eCDN will be unable to establish peer-to-peer connections between user devices.
- Network Congestion: Without P2P optimization, every attendee in a Teams Live Event or Town Hall will pull a unique video stream directly from the internet, potentially saturating the corporate internet egress.
- Degraded User Experience: Increased buffering and lower video quality for users during large-scale internal events due to the lack of local content delivery.
- Affected Browsers: This impact applies to Google Chrome and Microsoft Edge (or any other Chromium-based browser) version 146 or higher.
#### Action Required
IT Administrators must implement the `LocalNetworkAccessAllowedForUrls` policy to permit eCDN functionality. Follow these steps:
- Identify Required URLs: Review the official Microsoft eCDN documentation to obtain the specific, tenant-relevant URLs that must be whitelisted.
- Configure Browser Policy:
- For Microsoft Intune: Use the Settings Catalog to locate and configure the “Allow Local Network Access for specific URLs” policy for Microsoft Edge and Google Chrome.
- For Group Policy (GPO): Update your Administrative Templates (.admx) and navigate to
Computer Configuration > Administrative Templates > Google > Google ChromeorMicrosoft Edgeto set theLocalNetworkAccessAllowedForUrlspolicy.
- Verify Deployment: Ensure the policy is applied to all workstations where users participate in Teams Live Events or Town Halls.
- Timeline: Complete these configurations before your users’ browsers update to version 146 to avoid service disruption.
Microsoft Official Update
Service: N/A
Category: planForChange
Severity: normal
Updated February 19, 2026: We have updated the content. Thank you for your patience.
We’re making some changes to the Microsoft eCDN configuration.
Starting with Chrome 146, browsers will enforce Local Network Access restrictions that may impact Microsoft eCDN peer-to-peer functionality.
[How this will affect your organization:]
You are receiving this message because our reporting indicates one or more users in your organization may be using Microsoft eCDN. To maintain optimal performance for Teams Live Events and Town Halls, admins must configure the LocalNetworkAccessAllowedForUrls policy for Chrome-based browsers.
[What you need to do to prepare:]
For complete, up-to-date details (including required URLs, deployment methods, and tenant-specific considerations), see the official Microsoft eCDN documentation: Configure Local Network Access Policy for Microsoft eCDN.
