Current status: All our ducks are in a row.

What is this site? We monitor the status of and our class sites, and we update here whenever there are interruptions in service.

Sunday, October 28, 2012


Starting at Sun 28 Oct 2012 7:30:00 PM PDT, Coursera will be performing preventive maintenance on our systems ahead of Hurricane Sandy. During this time, some class sites may not be available for up to 15 minutes. We apologize for any inconvenience caused.

Monday, October 22, 2012


Starting around 10:30 AM, we've  experiencing issues with our hosting provider (Amazon).  See for details.  We'll be back up soon!

Update (11:30AM PST): AWS issues seem to be more widespread than Amazon had anticipated and affecting a lot of our disks / storage on the cloud in multiple availability zones. We are contacting and working with AWS employees to resolve the issue. We are sorry for the inconvenience caused and hope to be back up soon.

Update(1:22PM PST): We're back up! Thanks for your patience.

Update(9:15PM PST): Our databases had intermittent issues again from 8.45PM -- 9.15PM PST. We're  back up again.

Wednesday, October 3, 2012


We experienced downtime from 4:45-5:00pm PST today while we were migrating away from a database system that has been causing problems over the last few weeks.

Tuesday, October 2, 2012


Our users are seeing intermittent service interruptions. We apologize, and are looking into the issues.

Update: The issues have been resolved and the site should be performing fine now. We experienced some intermittent database issues and have manually transitioned to more powerful machines; we're in the process of moving off the flaky sub-system by the end of this week. We apologize again for the inconvenience, and will closely monitor our systems for the next few hours to ensure site stability.