MC1066155 – Microsoft SharePoint Online: [Important update] Enabling a new Public Content Delivery Network (CDN) domain (archived)

Product:

SharePoint

Platform:

Online, US Instances, Web, World tenant

Status:

Launched

Change type:

Admin impact

Links:

MC1184996
489230

Details:

Summary:
Microsoft SharePoint Online will migrate to a new CDN service, Microsoft Azure Front Door, starting June 2025 and completing by July 2025. Organizations should add the new domain `public-cdn.sharepointonline.com` to their allow list, avoid hardcoding CDN URLs, and continue allowing the old domain. No admin action is required before the rollout.

Details:
Coming soon: We will migrate the hosting of Microsoft SharePoint Online assets to a new content delivery network (CDN) service, Microsoft Azure Front Door (AFD).
This message is associated with Microsoft 365 Roadmap ID 489230.
[When this will happen:]
General Availability (Worldwide): We will begin rolling out early June 2025 and expect to complete by late July 2025.

Change Category:
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Scope:
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Release Phase:
General Availability

Created:
2025-05-02

updated:
2025-05-02

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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linked item details

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summary for non-techies**

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Direct effects for Operations**

CDN Domain Allow Listing
Failure to add the new CDN domain to the allow list may result in users being unable to access SharePoint Online assets, leading to disruptions in service.
   - roles: IT Administrator, End User
   - references: https://learn.microsoft.com/microsoft-365/enterprise/use-microsoft-365-cdn-with-spo?view=o365-worldwide, https://www.microsoft.com/microsoft-365/roadmap?filters=&searchterms=489230

Hardcoding CDN URLs
If organizations have hardcoded the old CDN URLs, they may experience broken links or missing assets, negatively impacting user experience and productivity.
   - roles: Developer, End User
   - references: https://learn.microsoft.com/microsoft-365/enterprise/use-microsoft-365-cdn-with-spo?view=o365-worldwide, https://www.microsoft.com/microsoft-365/roadmap?filters=&searchterms=489230

Old Domain Blocking
Blocking the old CDN domain could lead to service interruptions as users may still rely on it for accessing SharePoint Online content.
   - roles: IT Administrator, End User
   - references: https://learn.microsoft.com/microsoft-365/enterprise/use-microsoft-365-cdn-with-spo?view=o365-worldwide, https://www.microsoft.com/microsoft-365/roadmap?filters=&searchterms=489230

Performance Issues
Without proper preparation, users may experience slower load times or performance degradation during the transition to the new CDN, affecting overall user satisfaction.
   - roles: End User, IT Support
   - references: https://learn.microsoft.com/microsoft-365/enterprise/use-microsoft-365-cdn-with-spo?view=o365-worldwide, https://www.microsoft.com/microsoft-365/roadmap?filters=&searchterms=489230

Configuration Review
Neglecting to review current configurations may lead to unforeseen issues post-migration, resulting in additional support requests and user frustration.
   - roles: IT Administrator, Project Manager
   - references: https://learn.microsoft.com/microsoft-365/enterprise/use-microsoft-365-cdn-with-spo?view=o365-worldwide, https://www.microsoft.com/microsoft-365/roadmap?filters=&searchterms=489230

Configutation Options**

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Opportunities**

Improved Performance and Reliability
The migration to Azure Front Door for CDN services is expected to enhance the performance and reliability of SharePoint Online. This transition allows for better asset delivery speeds and reduced latency, which can significantly improve user experience across the organization.
   - next-steps: Conduct a performance analysis of current SharePoint Online usage to establish baseline metrics. Plan a communication strategy to inform users about the expected improvements and gather feedback post-migration.
   - roles: IT Administrators, End Users, Web Developers
   - references: https://learn.microsoft.com/microsoft-365/enterprise/use-microsoft-365-cdn-with-spo?view=o365-worldwide, https://www.microsoft.com/microsoft-365/roadmap?filters=&searchterms=489230

Streamlined Network Configuration
By adding the new CDN domain to the allow list and avoiding hardcoded URLs, organizations can streamline their network configuration processes. This reduces the risk of downtime or accessibility issues due to misconfigured URLs or blocked domains.
   - next-steps: Review current network configurations and update them to include the new CDN domain. Implement a policy to avoid hardcoding URLs in future development projects.
   - roles: Network Administrators, IT Security Teams, Application Developers
   - references: https://learn.microsoft.com/microsoft-365/enterprise/use-microsoft-365-cdn-with-spo?view=o365-worldwide, https://www.microsoft.com/microsoft-365/roadmap?filters=&searchterms=489230

Future-Proofing IT Infrastructure
The recommendation to avoid hardcoding CDN URLs is a step towards future-proofing IT infrastructure. This approach allows for easier updates and changes in the future without requiring significant rework of existing applications and scripts.
   - next-steps: Develop a best practices guide for application development that emphasizes the use of dynamic URL resolution instead of hardcoding. Conduct training sessions for developers to ensure compliance with new guidelines.
   - roles: Software Developers, IT Project Managers, IT Governance Teams
   - references: https://learn.microsoft.com/microsoft-365/enterprise/use-microsoft-365-cdn-with-spo?view=o365-worldwide, https://www.microsoft.com/microsoft-365/roadmap?filters=&searchterms=489230

Potentional Risks**

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IT Security**

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explanation for non-techies**

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