Microsoft is blocking access to the insecure FPRPC protocol in Microsoft 365 apps for Windows from late August 2025 to enhance security and reduce reliance on outdated technologies. This follows previous updates that restrict file access via outdated protocols. New security measures include disabling ActiveX controls, blocking certain Outlook attachments, and implementing features to block screenshots during Teams meetings. Administrators can manage authentication settings through the Cloud Policy Service, and users will have limited options to enable certain protocols under specific conditions.
Microsoft 365 apps for Windows will block access via the insecure FPRPC protocol by default starting late August 2025 to increase security by reducing exposure to outdated technologies.
New Trust Center settings will allow users to re-enable FPRPC if desired but will not apply if managed by Group Policy or Cloud Policy Service.
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