Office 365 Outage
The outage affecting Office 365 portal signin yesterday, also eventually spread to email services hosted by Exchange online.
This was the reported outage data:
MO133518 - Can't sign in
Status:
Service restored
User impact:
Users may have been unable to access the Office 365 service.
Latest message:
Title: Can't sign in
User Impact: Users may have been unable to access the Office 365 service.
More info: Users may have been unable to sign in to Exchange Online, SharePoint Online, Skype for Business, Intune, Power BI, Microsoft Teams, Yammer and the Office 365 portal.
Admins affected by this issue may not have had access to the Admin center. However, updates were provided on https://status.office.com and via the twitter handle @Office365Status.
Final status: A subset of infrastructure that handles authentication requests became degraded, causing user sign in failures. We recovered the affected infrastructure to mitigate impact and monitored the service to confirm resolution.
Scope of impact: This issue could have potentially affected any of your users if they were routed through the affected infrastructure.
Start time: Friday, April 6, 2018, at 8:30 AM UTC
End time: Friday, April 6, 2018, at 11:30 AM UTC
Preliminary root cause: A subset of infrastructure that handles authentication requests became degraded.
Next steps:
- We're analyzing performance data and trends on the affected systems to help prevent this problem from happening again.
We'll publish a preliminary post-incident report within 48 hours.
Updated:
2018-04-06 17:02 (UTC)
Start time:
2018-04-06 08:30 (UTC)
End time:
2018-04-06 17:02 (UTC)
