Microsoft Change On-line outage blocks entry to mailboxes worldwide

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Exchange Online

Microsoft is investigating an ongoing outage blocking Change On-line prospects worldwide from accessing their mailboxes or sending/receiving emails.

Affected customers see “550 5.4.1 Recipient tackle rejected: Entry denied” errors when making an attempt to ship or when receiving messages, beginning at this time at 1:11 PM UTC.

“We’re investigating a problem whereby customers could also be unable to entry their Change On-line mailboxes through any connection methodology. Further particulars will be discovered throughout the Service Well being Dashboard below EX522020,” Microsoft tweeted earlier at this time.

Prospects are additionally reporting on Twitter and Reddit that giant percentages of emails despatched to Change On-line mailboxes is not going to attain the recipients’ mailboxes.

“We have recognized a possible Listing Based mostly Edge Blocking (DBEB) difficulty that could be contributing to affect,” Microsoft stated in a service well being alert issued at this time at 5:22 PM UTC.

“We’re investigating this alongside our current diagnostic information to find out our subsequent steps. Affect is restricted to customers who’re served by the affected infrastructure in North America, Europe, and the UK.”

DBEB lets admins configure message rejection for invalid recipients and blocking for all messages despatched to e mail addresses not current in Microsoft 365 or Workplace 365. 

Whereas Redmond stated half-hour in the past that telemetry information indicated that the service was beginning to get better, a subsequent replace says that further monitoring revealed that the outage remains to be ongoing.

Earlier at this time, Redmond additionally mitigated a second outage stopping some customers within the Asia Pacific area from accessing the Change On-line and Microsoft Groups companies.

One other worldwide outage took down a number of Microsoft 365 companies in late January after a router IP tackle change led to packet forwarding points between routers in Microsoft’s Huge Space Community (WAN).

The listing of companies affected by final month’s outage included Microsoft Groups, Change On-line, Outlook, SharePoint On-line, OneDrive, the Microsoft 365 Admin Heart, Microsoft Graph, Microsoft Intune, and a number of other Microsoft Defender merchandise.

This can be a creating story …