MC1130392 – Microsoft 365 apps | New Trust Center settings to block insecure file open protocols (archived)

Product:

Entra, Microsoft 365 Apps, Microsoft 365 suite, Teams, Windows

Platform:

Android, iOS, Mac, Online, US Instances, Web, Windows Desktop, World tenant

Status:

Launched

Change type:

New feature, User impact, Admin impact

Links:

497299

Details:

Summary:
Microsoft 365 apps will block insecure file open protocols like FPRPC by default starting version 2508, with new Trust Center settings to manage these protocols. Admins can control settings via Group Policy or Cloud Policy service. Changes apply only to Microsoft 365 apps for Windows, not Teams.

Details:
Introduction
To help protect users from legacy protocol vulnerabilities, we're introducing new Trust Center settings in Microsoft 365 apps that block file opens using insecure protocols by default. These changes enhance security by reducing exposure to outdated technologies like FrontPage Remote Procedure Call (FPRPC), FTP, and HTTP.
This message is associated with Microsoft 365 Roadmap ID 497299.
When this will happen
Public Preview (Worldwide): We began rolling out in late July 2025 and expect to complete by late August 2025.
General Availability (Worldwide, GCC, GCC High, and DoD): We will begin rolling out in late August 2025 and expect to complete by late September 2025.

Change Category:
XXXXXXX ... free basic plan only

Scope:
XXXXXXX ... free basic plan only

Release Phase:
General Availability, Preview

Created:
2025-08-07

updated:
2025-08-07

Public Preview Start Date

XXXXXXX ... free basic plan only

Task Type

XXXXXXX ... free basic plan only

Docu to Check

XXXXXXX ... free basic plan only

MS How does it affect me

XXXXXXX ... free basic plan only

MS Preperations

XXXXXXX ... free basic plan only

MS Urgency

XXXXXXX ... free basic plan only

MS workload name

XXXXXXX ... free basic plan only

linked item details

XXXXXXX ... free basic plan only

summary for non-techies**

XXXXXXX ... free basic plan only

Direct effects for Operations**

Blocking of Insecure Protocols
Users may experience issues opening files that rely on the FPRPC protocol, leading to potential disruptions in workflow and productivity.
   - roles: End Users, IT Administrators
   - references: https://www.microsoft.com/microsoft-365/roadmap?filters=&searchterms=497299

Trust Center Settings Management
If Trust Center settings are centrally managed, users may not have the ability to adjust their file open protocols, leading to confusion and frustration.
   - roles: End Users, IT Administrators
   - references: https://www.microsoft.com/microsoft-365/roadmap?filters=&searchterms=497299

Increased Support Requests
The change may lead to an increase in support requests from users who are unable to open files as expected, impacting IT support resources.
   - roles: IT Support Staff, End Users
   - references: https://www.microsoft.com/microsoft-365/roadmap?filters=&searchterms=497299

Training and Communication Needs
Users will require training and communication regarding the new settings and their implications, which may not be adequately prepared for, leading to user dissatisfaction.
   - roles: End Users, Training Coordinators
   - references: https://www.microsoft.com/microsoft-365/roadmap?filters=&searchterms=497299

Compatibility Issues with Legacy Systems
Blocking of legacy protocols may cause compatibility issues with older systems or applications that rely on these protocols, disrupting business processes.
   - roles: End Users, Application Managers
   - references: https://www.microsoft.com/microsoft-365/roadmap?filters=&searchterms=497299

Configutation Options**

XXXXXXX ... paid membership only

Opportunities**

Enhanced Security Management
With the introduction of new Trust Center settings, admins can better manage and control file open protocols, enhancing overall security posture. By blocking insecure protocols by default, the risk of exploitation from legacy technologies is reduced, leading to a more secure IT environment.
   - next-steps: Review current Group Policy settings and assess the need for adjustments to align with the new Trust Center settings. Implement training for admins on how to manage these settings effectively.
   - roles: IT Security Managers, System Administrators, Compliance Officers
   - references: https://www.microsoft.com/microsoft-365/roadmap?filters=&searchterms=497299

User Training and Awareness
Informing users about the changes in file opening protocols and how it affects their workflow will improve user experience and reduce confusion. Training can help users adapt to the new settings and understand the importance of these security measures.
   - next-steps: Develop and distribute training materials explaining the changes, how to navigate the new Trust Center settings, and the implications of blocking insecure protocols.
   - roles: Training Coordinators, IT Support Staff, User Experience Designers
   - references: https://www.microsoft.com/microsoft-365/roadmap?filters=&searchterms=497299

Streamlined IT Operations
Centralized management of file open protocols through Cloud Policy service (CPS) or Group Policy can lead to more efficient IT operations. This allows for consistent application of security policies across the organization, reducing the administrative burden on IT teams.
   - next-steps: Evaluate the current use of CPS and Group Policy in managing protocols. Identify any gaps in policy application and create a plan to streamline protocol management across the organization.
   - roles: IT Operations Managers, System Administrators, Network Engineers
   - references: https://www.microsoft.com/microsoft-365/roadmap?filters=&searchterms=497299

Potentional Risks**

XXXXXXX ... paid membership only

IT Security**

XXXXXXX ... paid membership only

explanation for non-techies**

XXXXXXX ... free basic plan only