Wednesday July 30, 2025

Summary

On July 30, 2025, from approximately 3:29 PM PDT to 3:53 PM PDT, some users experienced issues with various Slack features, including loading the app, connecting, sending and receiving messages, and using search and workflows.

A recent change to a backend caching system introduced a configuration mismatch. This led to an overwhelming number of requests made to a primary database that supports several Slack features, causing some requests to timeout, creating errors within the app. To help alleviate immediate impact, we quickly increased resources, allowing it to stabilize.

By 3:53 PM PDT, we had a clearer understanding of the user impact and symptoms, allowing us to communicate with affected users through our status site. At the same time, we rolled back to a confirmed working version of Slack, restoring full functionality to affected features. We then monitored additional logging & metrics for a duration of time before declaring the issue fully resolved at around 4:28 PM PDT.

6:15 PM PST

Resolved

This issue is now resolved for all users.

• Current status and recent actions taken: We identified the cause and implemented remediation efforts to restore functionality to affected features.
• Scope: Users globally may have experienced symptoms.
• Previous impact to end users: Users may have encountered issues loading or connecting to Slack, sending or receiving messages, completing search queries, running workflows, and viewing or loading threads.
• Required resolution steps: No required steps. If you encounter any further trouble, a hard refresh would be encouraged (Cmd/Ctrl + Shift + R).

We apologize for any disruptions to your day.

4:28 PM PST

Update

 We're seeing signs of improvement and are monitoring our health metrics. Affected users may begin seeing improvements in using affected features.

Current status and actions being taken: We identified the cause of the issue and have initiated remediation efforts to restore functionality of impacted features.

Estimated time to resolution: No estimated time.

Scope: Users globally may have experienced symptoms.

Current impact to end users: Users may have trouble connecting to or loading Slack, workflows, using search, sending or receiving messages, and viewing or loading threads. Users may also experience a "We're having trouble loading your workspace" error pages.

We'll continue to provide updates every 30 minutes until the impact is resolved for all users.

 

4:23 PM PST

Investigating

 Users may be experiencing issues connecting to or loading Slack, as well as sending or receiving messages. We'll aim to follow up with more information in 30 minutes or sooner if more information becomes available. 

3:59 PM PST