Slack users are facing a morning of chaos as the online chat service is down.
Some users are unable to access the website while others are received errors when trying to send messages.
Slack has apologised for the disruption but say it could take up to 24 hours to resolve the problem.
A spokesperson for the company said on Twitter: "Our investigation of this connection issue is still ongoing at this time. We’ll be back with another update and apologize for this disruption. Thank you for your continued patience."
The Slack system status website said it will take some time for the DNS changes to resolve this issue for everyone.
Slack said the issues are DNS-related and added in a statement: "We are aware of connectivity issues related to DNS that are impacting a small subset of users.
"This issue was caused by our own change and not related to any third-party DNS software and services. In order to resolve this faster, your ISP (Internet Service Provider) will need to flush their DNS record for slack.com. Please reach out to your networking team to provide them with this information.
"We expect all customers’ connectivity issues to be resolved within the next 24 hours. We know how important it is for people to stay connected and we apologize for this disruption."
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