Global WAN networking event impacting Azure, Microsoft 365, and connectivity

Impact

A WAN router command executed during a router addition caused packets to be forwarded incorrectly across Microsoft’s global WAN, disrupting Azure, Teams, and Outlook worldwide - worst for roughly 90 minutes, with full recovery within hours.

Affected service

Affected regions

Timeline

Updates newest first (times in UTC).

1. ResolvedJan 25, 2023, 12:43 PM UTC

   Network connectivity fully restored across the Microsoft global WAN.

2. MonitoringJan 25, 2023, 9:30 AM UTC

   The majority of network devices have recovered; monitoring residual packet loss as the WAN converges.

3. MitigatingJan 25, 2023, 8:20 AM UTC

   A recent WAN configuration change identified as the cause; the change has been rolled back and routers are being restored to a healthy state.

4. InvestigatingJan 25, 2023, 7:30 AM UTC

   Investigating network connectivity issues affecting Azure services and Microsoft 365 globally.

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