(Updated) Action Required - Microsoft Defender for Cloud Apps Network Configurations Changes

Due to ongoing work on Microsoft Defender for Cloud Apps, network information updates are required. The change is under review, and further instructions will be communicated via the Message center. Administrators may not see the organization logo on the M365 portal overview page once implemented. Update firewall rules accordingly.

Updated April 30, 2025: We are in the process of reviewing this change and will update the Message center post once we are ready to proceed. Please ignore the Message center post till further notice. Thank you for your patience.

Due to ongoing work on Microsoft Defender for Cloud Apps aimed at improving security and performance, you are required to update network information in your system's firewall and additional third-party services by the dates noted below.

[When this will happen:]

We will communicate via Message center when we are ready to proceed.

[How this affects your organization:]

You are receiving this message because our reporting indicates your organization may be using Microsoft Defender for Cloud Apps. Administrators may no longer be able to be able to see the Organization logo on M365 portal in the overview page. when this change is implemented.

[What you need to do to prepare:]

Please update your firewall rules to allow below endpoints by: We will communicate via Message center when we are ready to proceed.

1. discoveryresources-cdn-prod.cloudappsecurity.com
2. discoveryresources-cdn-gov.cloudappsecurity.us 

All required outbound access URLs can also be found in Network requirements under "Portal Access"