Thursday July 27, 2023

Issue summary: On July 27, 2023 between 2:03 AM PDT - 2:59 AM PDT, Slack was experiencing a systemwide issue during which users were not able to send or receive messages across multiple platforms. Our engineering team identified an issue after a change was made to a service that manages our internal system communication. This resulted in degradation of Slack functionality until the change was reverted which resolved the issue for all users. We are currently hard at work on scoping measures to prevent this from happening in the future. More information about remediation and prevention steps will be included in an upcoming RCA which you can request by writing into feedback@slack.com.

7:32 AM PST

Our engineering teams identified an issue after a change was made in a service that manages our internal system communication. The issue was identified, corrected by our engineers and this resolved the issue for all affected users.

3:43 AM PST

Slack is now back up and all features are functional. Users may need to reload their apps to see this restoration. We appreciate your patience during our investigation of this outage.

3:13 AM PST

Slack is experiencing a systemwide issue. Users may be experiencing trouble with sending messages, using workflows and various other actions in Slack. We’re investigating and will let you know as soon as we know more. We appreciate your patience in the meantime.

2:57 AM PST

Users may be experiencing trouble with sending messages in Slack. We’re investigating and will let you know as soon as we know more. We appreciate your patience in the meantime.

2:35 AM PST