Tuesday November 17, 2020

Incident

Degraded performance and connection issues for a very low percentage of users

Issue summary:
On November 17, 2020 from around 8:58 a.m. to 9:35 a.m. PST, a small number of users experienced intermittent issues, such as slowness within Slack, trouble loading Slack, and messages failing to send.

There were too many connections being sent to our query routing infrastructure, which resulted in requests being slow or failing to complete. We added more capacity to the infrastructure in order to handle more requests and prevent requests from being slow or failing to complete.

If you'd like to receive a Root Cause Analysis (RCA) report, please reach out to feedback@slack.com to request one. We'll send you the report once it's ready.

Note: We've added new details in the second paragraph of this message, as we've uncovered more information about what happened.

10:18 AM PST

We’re confident that customers shouldn’t be experiencing troubles with performance in Slack after monitoring for the last hour. Our team is still reviewing the cause of the issue, and we’ll provide a summary here once our investigation is complete.

10:37 AM PST

We've isolated the issue and users should no longer be having problems with Slack. We're still working towards a full resolution and we'll be back with another update in 30 minutes.

10:04 AM PST

Some people may be having trouble loading Slack via the desktop and mobile apps, as well as web browser. This is currently affecting a very low percentage of users but may result in general slowness and issues with sending messages. We’re investigating, and we'll have more information to share in 30 minutes.

9:33 AM PST

Services affected

Posts/Files

Workspace/Org Administration

Login/SSO

Notifications

Connections

Calls

Messaging

Search

Link Previews

Apps/Integrations/APIs

Status

Incident