Thousands of users reported issues, with DownDetector logging over 15,000 outage reports.
The outage primarily affected major U.S. metro areas, including San Francisco, Seattle, Washington D.C., Chicago, Boston, and New York City.
Users took to social media to express their frustration, with many unable to perform their work tasks.
Slack's status page initially showed all systems as operational, despite widespread user reports.
The Slack outage began around 1:15 p.m. EDT on Monday, November 10, 2025. According to DownDetector, the issues reported included server errors and connection problems. Many users found the app completely unresponsive, preventing them from sending or receiving messages.
The incident highlights the reliance of modern workplaces on communication platforms like Slack. When such services experience downtime, it can lead to significant disruptions in workflow and productivity. The lack of immediate official communication from Slack regarding the cause and estimated resolution time added to user frustration.
While the exact cause of the outage remains unclear, similar incidents in the past have been attributed to server issues, network problems, or software glitches. Companies like Slack continuously work to improve their infrastructure and monitoring systems to minimize the impact of such disruptions.
Q: What caused the Slack outage?
The exact cause of the outage has not been officially disclosed by Slack.
Q: When did the Slack outage occur?
The outage began around 1:15 p.m. EDT on Monday, November 10, 2025.
Q: How many users were affected by the Slack outage?
Over 15,000 outage reports were filed on DownDetector.
Slack's outage underscores the importance of having backup communication methods in place.
Businesses should ensure their teams have alternative ways to communicate during such disruptions.
Users can monitor DownDetector and Slack's official status page for updates during outages.
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