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Configure Local Network Access Policy for Microsoft eCDN

From Microsoft 365 Message Center Archive by Merill Fernando · Microsoft may not have sent this notice to your tenant.
Microsoft TeamsMicrosoft 365 for the webMicrosoft 365 apps
Microsoft 365 admin center

Rollout

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What the notice says

Microsoft’s text, safely structured

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.

What changed

Between archive captures, newest first
    • Tags User impact, Admin impact → Updated message, User impact, Admin impact

    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 142,146, browsers will enforce Local Network Access restrictions that may impact Microsoft eCDN … reporting indicates one or more users in your organization may be using this Microsoft eCDN. To maintain optimal performance for Teams Live Events and Town Halls, admins must configure the LocalNetworkAccessAllowedForUrls policy for Chrome-based browsersbrowsers. What you need to do to prepare: Admins will need to: Add the following URLs to the LocalNetworkAccessAllowedForUrls policy in your environment: *.ecdn.teams.microsoft.com https://teams.microsoft.com *.ecdn.teams.cloud.microsoft https://teams.cloud.microsoft https://engage.cloud.microsoft/ Apply these settings via Group Policy or registry keys for: Microsoft Edge: HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Edge\ Google Chrome: HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Google\Chrome\ For US Government tenants, use GCC/GCC High-specific hostnames as outlined in the documentation. Additional Notes: This change aligns with Microsoft’s Unified Domains initiative. Ensure your network filters include both legacy complete, up-to-date details (including required URLs, deployment methods, and new domains. Pair this configuration with WebRtcLocalIpsAllowedUrls for full peer-to-peer functionality. Firefox restrictions are planned but not yet enforced. See documentation for full guidance: tenant-specific considerations), see the official Microsoft eCDN documentation: Configure Local Network Access Policy for Microsoft eCDNeCDN.

    • Services Microsoft 365 for the web, Microsoft 365 apps → Microsoft Teams, Microsoft 365 for the web, Microsoft 365 apps
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