Tuesday August 25, 2020


Degraded service affecting multiple features

Issue summary:
On August 25, 2020 from 2:30 a.m. to 4:20 a.m. PDT, some customers in western and southern Europe and the UK experienced failures in Slack when posting messages and uploading or viewing files. Some server instances for this region were experiencing significant issues that resulted in some instability.

We began to move customers away from the impacted region but it took longer than expected. We conducted a forcible withdrawal of the region's traffic at 4:03 a.m. PDT which successfully removed all traffic away from the impacted server instances. With this process being completed, Slack returned to normal for the affected users. There are still ongoing recovery efforts to ensure that our capacity issues are thoroughly cleared.

2:53 PM PST

Customers affected by issues with files and messages should no longer be having trouble. Apologies for the disruption to your day and thank you for your patience.

4:37 AM PST

We’ve isolated the problems with sending messages and files to users in Europe. We’ll be back with an update in 30 minutes.

4:01 AM PST

Some customers are having trouble with files, messages and connecting to Slack. We’re investigating and will have more information to share 30 minutes.

3:26 AM PST

Some people may be having an issue with Slack. We’re currently investigating and will have more information shortly. Thank you for your patience.

3:09 AM PST

Features affected