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Microsoft Network Sends Test Traffic to Japanese Cable Maker

Q: What was the unexplained anomaly on Microsoft's network?

The anomaly involved Microsoft's network misrouting internet traffic designated for example.com to a Japanese electronics cable manufacturer, Sumitomo Electric.

Q: Has Microsoft fixed the network routing anomaly?

Yes, the behavior has ceased, and current output shows 'not found' errors, suggesting the removal of the endpoint responsible for the improper routing.

27 Jan

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Summary

Microsoft's network misrouted internet test traffic to a Japanese company.
The anomaly routed traffic for example.com to sei.co.jp subdomains.
Microsoft has since removed the endpoint causing the routing error.

Microsoft Network Sends Test Traffic to Japanese Cable Maker

An unexplained anomaly on Microsoft's network rerouted internet traffic designated for example.com to a Japanese electronics cable manufacturer, Sumitomo Electric.

Under internet standards, example.com should not be routable online but should direct to local network resources. However, Microsoft's autodiscover service was sending traffic, including email setup attempts for Outlook, to sei.co.jp subdomains.

While the specific cause remains unconfirmed by Microsoft, the behavior has ceased. Output now shows 'not found' errors, suggesting the removal of the specific endpoint responsible for the improper routing.