Science & Tech · Big Tech & Internet · 3 hrs ago
Microsoft restores Exchange Admin Center after configuration change
Microsoft’s Exchange Admin Center was unavailable to administrators on October 12 after a configuration change caused access errors.
The service is a web-based console used to manage Exchange Online, including mailboxes and groups.
Microsoft said the change caused unexpected responses that prevented administrators from getting in.
It reverted the change, which restored normal access before the end of the working day.
The outage left administrators without access to those management tools while it lasted.
Microsoft said it will review the change and its monitoring to improve detection of similar problems.
A preliminary incident report is due within two business days, followed by a final report next week.
Microsoft restored the Exchange Admin Center after a configuration change prevented administrators from accessing it.
Affected administrators encountered an “Internal Server Error” when trying to use the service.
Microsoft said the change caused unexpected HTTP responses in the affected request path.
Reverting the change restored expected service functionality.
Microsoft said it would review the change and its monitoring and alerting.
- Who
- Microsoft and administrators trying to access the Exchange Admin Center.
- What
- Microsoft restored access after a configuration change caused service failures.
- When
- October 12, 2026.
- Where
- The Exchange Admin Center, which manages Exchange Online.
- Why
- A configuration change caused unexpected HTTP responses in the affected request path.
This story does not have two clearly opposing sides.
Microsoft acknowledged that administrators attempting to access the Exchange Admin Center could encounter an Internal Server Error.
Microsoft reported unexpected 302 redirect errors and said it was investigating the access failures.
Microsoft said it was testing a rollback of the recent change.
Microsoft said reverting the configuration change restored expected service functionality.
- Affected service
- Exchange Admin Center
- Date
- October 12, 2026
- Error reported
- Internal Server Error
- Cause
- Configuration change caused unexpected HTTP responses
- Resolution
- Reverting the identified change restored service functionality
- Post-incident report
- Preliminary report due within two business days; final report due next week
What people are saying
A recent EAC configuration change resulted in unexpected HTTP responses within the affected request path, preventing admins from successfully accessing the EAC.
Reverting the identified change restored expected service functionality.
We've identified unexpected 302 redirect errors during affected Exchange admin center (EAC) access attempts and are analyzing diagnostic logs to isolate the source of the access failures.
While we continue our investigation, admins remain unable to access the EAC, with no workaround currently available.
Sources
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