Microsoft 365 Suffers Widespread Outage with 502 and 503 Errors

Key Takeaways

• Microsoft 365 services, including core applications, are experiencing widespread access issues globally.
• Users are encountering 502 and 503 HTTP errors, indicating backend server or gateway problems.
• The incident, identified as MO1472904, began on September 16, 2026, at 7:17 PM GMT+5:30.
• Microsoft’s engineering teams are actively investigating the root cause, with no immediate resolution timeline provided.

Microsoft 365 Hit by Global Access Issues, Users Report 502 and 503 Errors

Microsoft has confirmed a significant degradation of its Microsoft 365 services, leading to widespread access problems for users across the globe. Since the evening of September 16, 2026, individuals and organizations have reported difficulties reaching core applications within the productivity suite.

Incident Details and Error Codes

The disruption, internally designated as MO1472904, commenced at 7:17 PM GMT+5:30. While Microsoft has categorized it as a service degradation rather than a complete outage, the impact has already triggered numerous complaints from both enterprise and consumer sectors. According to advisories issued through Microsoft’s admin center, affected users are consistently encountering 502 and 503 HTTP error codes. These specific errors typically point to issues such as overloaded backend servers, gateway timeouts, or failures within upstream infrastructure, rather than problems related to user authentication or credentials.

Investigation Underway, No Immediate Resolution

In its most recent communication, posted at 7:36 PM GMT+5:30, Microsoft stated that its engineering teams are actively analyzing service telemetry and user reports to pinpoint the underlying cause and formulate corrective actions. The company has committed to providing its next official update by 3:30 PM UTC, suggesting that a definitive timeline for resolution remains undetermined. The Microsoft 365 Status Twitter account also acknowledged the issue, stating, “We’re investigating an issue with users being unable to access some Microsoft 365 services. Further details are provided under MO1472904 in the admin center.”

Pattern of Recent Disruptions

This latest incident contributes to a series of operational challenges for Microsoft’s cloud productivity ecosystem throughout 2026. Prior disruptions include a multi-day authentication failure affecting Exchange Online in late August, and a network misconfiguration in July that impacted Teams and SharePoint services across North America. While those earlier events were linked to authentication component failures and erroneous network updates, Microsoft has not yet indicated whether MO1472904 shares a similar root cause.

What You Should Do

• Monitor Microsoft 365 Admin Center: IT administrators should closely follow the Microsoft 365 admin center for the most current and granular information regarding the scope and impact of MO1472904.
• Avoid Unnecessary Changes: Organizations experiencing disruption should refrain from implementing password resets or making configuration modifications until Microsoft provides clear guidance on the fault domain. Such actions have been known to complicate recovery efforts during previous incidents.
• Distinguish from Malicious Activity: Security teams are advised to differentiate between genuine service degradation and potential denial-of-service attempts. Error codes alone are not sufficient to rule out malicious traffic.

Disclaimer: HackersRadar reports on cybersecurity threats and incidents for informational and awareness purposes only. We do not engage in hacking activities, data exfiltration, or the hosting or distribution of stolen or leaked information. All content is based on publicly available sources.