Cyber Threat Summary:
Microsoft is investigating ongoing Microsoft 365 issues preventing some Exchange Online customers from accessing their mailboxes. "We've identified an issue affecting Exchange Online connectivity for users in North America and are investigating further," the company tweeted earlier. "More details can be found in the Microsoft 365 admin center under EX546390." According to outage monitoring platform Downdetector, thousands of Microsoft 365 report experiencing server connection and login issues, as well as when accessing their Outlook mailboxes. Some customers see errors when trying to log into their accounts, while others are caught in a sign-in loop where they're asked to enter their passwords. Microsoft says these Exchange Online connectivity problems only affect North American users. While the company added that more info on this outage can be in the Microsoft 365 admin center under EX546390, the advisory only says that Microsoft is "looking into a potential problem" and the "potential end-user impact."

Analyst Comments:
Last month, another outage blocked Exchange Online customers worldwide from accessing their mailboxes and sending or receiving emails. Yesterday, Microsoft addressed more Microsoft 365 issues preventing some users from searching assets across multiple services, including but not limited to Outlook on the Web, Exchange Online, SharePoint Online, Microsoft Teams, and Outlook desktop clients. Multiple Microsoft 365 services were taken down last week by another outage, blocking customers worldwide from signing into their accounts and seeing their web apps. A massive outage also hit Microsoft 365 in January after router packet forwarding issues within Microsoft's Wide Area Network (WAN) were inadvertently triggered by a router IP address update.

Corrections or Suggestions:
Microsoft says the Exchange Online connectivity issues have been resolved via automated recovery, “We've confirmed that our automated recovery systems took action to reroute affected traffic to alternate infrastructure, which resolved the issue. More details can be found in the Microsoft 365 admin center under EX546390” (Twitter: Microsoft, 2023).

Link:
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