check before: 2025-11-25
Product:
Microsoft 365 Apps, Microsoft 365 for the web, Microsoft Edge, Teams
Platform:
Online, US Instances, Web, World tenant
Status:
Change type:
Admin impact, Updated message, User impact
Links:
Details:
Summary:
Starting with Chrome 146, Local Network Access restrictions may affect Microsoft eCDN peer-to-peer functionality. To ensure optimal Teams Live Events performance, admins must configure the LocalNetworkAccessAllowedForUrls policy for Chrome-based browsers as detailed in the updated Microsoft eCDN documentation.
Details:
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.
Change Category:
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Scope:
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Release Phase:
Created:
2025-11-26
updated:
2026-02-20
Task Type
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Docu to Check
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MS How does it affect me
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MS Preperations
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MS Urgency
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MS workload name
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summary for non-techies**
Microsoft eCDN's peer-to-peer functionality with Chrome-based browsers is affected by new Local Network Access restrictions starting with Chrome version 146, requiring administrators to configure the LocalNetworkAccessAllowedForUrls policy to maintain optimal performance for Teams Live Events.
Direct effects for Operations**
Local Network Access Restrictions
Failure to configure LocalNetworkAccessAllowedForUrls may lead to degraded performance of Microsoft eCDN, affecting Teams Live Events and Town Halls.
- roles: IT Admin, Event Coordinator
- references: https://learn.microsoft.com/deployedge/microsoft-edge-browser-policies/localnetworkaccessallowedforurls, https://learn.microsoft.com/ecdn/how-to/configure-local-network-access-policy
User Experience Degradation
Users may experience interruptions or poor quality during Teams Live Events if Local Network Access is not properly configured, leading to frustration and decreased productivity.
- roles: End User, Event Participant
- references: https://learn.microsoft.com/deployedge/microsoft-edge-browser-policies/localnetworkaccessallowedforurls, https://learn.microsoft.com/ecdn/how-to/configure-local-network-access-policy
Increased Support Requests
Unprepared changes may result in a spike in support requests from users facing issues with Microsoft eCDN functionality, straining IT resources.
- roles: Help Desk Support, IT Admin
- references: https://learn.microsoft.com/deployedge/microsoft-edge-browser-policies/localnetworkaccessallowedforurls, https://learn.microsoft.com/ecdn/how-to/configure-local-network-access-policy
Configutation Options**
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Opportunities**
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Potentional Risks**
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IT Security**
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explanation for non-techies**
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** AI generated content. This information must be reviewed before use.
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change history
| Date | Property | old | new |
| 2026-02-20 | MC 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 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: Configure Local Network Access Policy for Microsoft eCDN https://learn.microsoft.com/ecdn/how-to/configure-local-network-access-policy | 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.
https://learn.microsoft.com/deployedge/microsoft-edge-browser-policies/localnetworkaccessallowedforurls https://learn.microsoft.com/ecdn/how-to/configure-local-network-access-policy |
| 2026-02-20 | MC MessageTagNames | User impact, Admin impact | Updated message, User impact, Admin impact |
| 2026-02-20 | MC Summary | Admins must configure the LocalNetworkAccessAllowedForUrls policy in Chrome-based browsers to allow specific Microsoft eCDN URLs, ensuring optimal Teams Live Events performance amid new Local Network Access restrictions starting with Chrome 142. Apply settings via Group Policy or registry keys; see documentation for details. | Starting with Chrome 146, Local Network Access restrictions may affect Microsoft eCDN peer-to-peer functionality. To ensure optimal Teams Live Events performance, admins must configure the LocalNetworkAccessAllowedForUrls policy for Chrome-based browsers as detailed in the updated Microsoft eCDN documentation. |
| 2026-02-20 | MC Last Updated | 11/26/2025 19:38:20 | 2026-02-19T18:14:38Z |
| 2026-02-20 | MC Messages | We're making some changes to the Microsoft eCDN configuration.
Starting with Chrome 142, browsers will enforce Local Network Access restrictions that may impact Microsoft eCDN peer-to-peer functionality. | 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. |
| 2026-02-20 | MC How Affect | You are receiving this message because our 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 browsers | 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. |
| 2026-02-20 | MC Title | Configure Local Network Access Policy for Microsoft eCDN | (Updated) Configure Local Network Access Policy for Microsoft eCDN |
| 2026-02-20 | MC End Time | 02/23/2026 09:00:00 | 2026-02-27T09:00:00Z |
| 2025-11-27 | MC Last Updated | 11/25/2025 23:29:04 | 2025-11-26T19:38:20Z |
Last updated 2 weeks ago ago
