On February 27th 2019 between 4:45am and 6:36am PST, Slack experienced issues with Posts. In particular, an expired certificate for Slack's post servers prevented users from creating, modifying or reading Posts. We investigated the root cause and a valid certificate was generated and installed. We have made plans to prevent this from happening in the future.
6:34 PM PST
We're happy to report that the trouble with editing posts has now been resolved. We appreciate your patience and apologize for any inconvenience that was caused.
6:39 AM PST
Some customers are experiencing trouble typing in posts at this time. We apologise for any interruption and we will continue to investigate.
5:15 AM PST