Data Centre


Ever wanted to strangle Microsoft? Now Outlook, Skype 'throttle' users amid storm cloud drama

Weird error message triggered by Azure update blunder

By Chris Williams, Editor in Chief


Folks around the planet are today unable to use Microsoft Skype and Office 365's Outlook due to a baffling "Throttled" error message.

The weird text box pops up in the chat software and cloud-backed email client, preventing people from sending messages, and talking to contacts.

This is, according to Microsoft, due to a botched update to Azure's backend authentication systems. The internal upgrade was introduced as its engineers brought servers knocked out by storms in Texas back online, and promptly broke Outlook and Skype. Outlook Web Access is said to be unaffected.

According to mailing list chatter among IT bods and other sysadmins seen by The Register in the past hour, as well as tweets and Reddit threads, the outage is hitting businesses and subscribers at least throughout America, Canada, the UK, and Europe.

Microsoft sharpens its claws to cut Outlook UI excess, snip Ribbon


A representative for Office 365 team confirmed a few moments ago: "We're taking corrective actions to address an issue in which users are receiving a message indicating that they are being throttled when accessing Outlook or Skype. More details on this event can be found in the admin portal under EX147785."

The downtime is linked to Azure's nightmare week, in which tropical storms and lightning strikes caused a power spike in Microsoft's Texas data center, knocking out cooling systems and forcing servers and services to shut down.

As Microsofties worked to bring the South Central US facility back online – under the support ticket MO147606 – they introduced a change to Office 365's authentication system. That internal update, according to a note to customers seen by El Reg, was hoped to remedy the outage, but instead led to today's TITSUP situation – seemingly a total inability to support users' passwords:

EX147785 – Unable to access Outlook or Skype

Title: Unable to access Outlook or Skype User

Impact: Users may receive a message indicating they are being throttled when accessing Outlook or Skype.

Current status: As part of our follow-up remediation actions stemming from the issue reported under service incident MO147606, an update was introduced to the components that manage authentication. We've determined that this update has resulted in users receiving a message indicating they are being throttled when attempting to access Outlook and Skype. We're reverting the update to remediate the problem.

Scope of impact: This issue could potentially affect any of your users intermittently if they are routed through the affected infrastructure.

Start time: Wednesday, September 5, 2018, at 5:30 PM UTC

Preliminary root cause: A recent update to components that manage authentication requests has resulted in users receiving a message indicating that they are being throttled when accessing some Office 365 services.

Next update by: Wednesday, September 5, 2018, at 6:30 PM UTC

The upshot is that while trying to log into Skype or the Outlook Office 365 service, punters today saw the following odd error box:

Naturally, everyone's taking it well...

A spokesperson for Microsoft told us she would get back to us with more information as soon as possible. We understand the dodgy backend change has been backed out, so you may be able to log into Skype and Outlook by the time you read this. ®

Sign up to our NewsletterGet IT in your inbox daily


More from The Register

Microsoft sends partners hundreds of unwanted OPI: Other People's Invoices

Risky business: Azure cloud rains bills

How do you like dem Windows, Apple? July opening for Microsoft's first store in Blighty

High Street help with those Blue Screens of Death

Headsup for those managing Windows 10 boxen: Microsoft has tweaked patching rules

One category to rule them all? Er, maybe not...

Microsoft throws lifeline to .NET orphans in the brave new Core world

It is acronym Monday as WCF and WF get OSS projects

Devs slam Microsoft for injecting tech-support scam ads into their Windows Store apps

Redmond kinda just shrugs after advertising systems sling scareware pop-ups at users

Microsoft admits: Yes, miscreants leafed through some Hotmail, MSN, Outlook inboxes after support rep pwned

Email contents exposed for unlucky punters

Microsoft flings the Windows Calculator source at GitHub

Something about calc.exe bugging you? Get in there and fix it

Behold the might of dynamic crimefighting duo Captain Met Police and the Microsoft Kid

Office 365 to demonstrate legendary ability to not fall over when pushed to the front line

What's in store for Microsoft's US pop-up shops? Not much, they're being closed

Hello London! Buh-bye kiosks

There's a Snowflake in Washington: Microsoft lets data warehouser in on Azure Government

What did you think we meant?