Microsoft 365 Alert – Service Degradation – Windows 365 – Some users may experience intermittent latency and connection failures in Windows 365 – RESOLVED

27/03/2026 09:15:00 AM

NHSmail Reference: INC46783918

Microsoft Reference: WP1262624

Issue Status: RESOLVED

Issue Description: Users may have experienced intermittent latency and connection failures in Windows 365.

Final Update: 27/03/2026 09:15:00 AM–Microsoft has identified that a recent configuration change designed to optimize several aspects of network connectivity behavior for incoming traffic contained a code issue which resulted in impact. They have reverted the offending configuration change and validated with internal testing and monitoring that the issue is remediated.

Scope of impact: Some users accessing Windows 365 may have been intermittently impacted.

Root cause: A recent configuration change designed to optimize several aspects of network connectivity behavior for incoming traffic contained a code issue which resulted in impact.

Next steps : Microsoft are further reviewing the configuration change to understand how the code issue was introduced, and to understand what prevented it from being detected in our update testing and validation procedures, which will allow us to prevent similar issues in future updates.