Current status: All our ducks are in a row.

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

Friday, March 29, 2013

2013-03-29: Preventative Maintenance Concluded

The preventative maintenance has concluded without any service interruption. Thank you for your understanding as we work to make Coursera as reliable and speedy as possible.

2013-03-29 - Preventative Maintenance

We are performing preventative maintenance on our homepage (www.coursera.org). Users may encounter slowness during the course browsing experience. The in-class experience will not be affected. Check back here (www.coursera.org) for updates. Thank you for your patience as we make Coursera as reliable and fast as possible.

Thursday, March 28, 2013

2013-03-28 - Resolved: Minor service interruptions

Normal access to the home page has been restored. Access was restored around 11:15am PDT. We apologize for the inconvenience.

2013-03-28 - Update: Minor Service Interruptions

Access to the home page (www.coursera.org) remains intermittent. A team of more than 5 engineers from Coursera and a team of more than 3 from Amazon Web Services have been working on the issue since 5:45am PDT this morning. Working with the team from Coursera, Amazon engineers have isolated the underlying issues to be related to their own internal management processes. We continue to work closely together with the team from Amazon to resolve the underlying issues. In parallel, we are rewriting portions of the home page to function without the underlying database so students and instructors can continue to navigate to their classes. The in-class experience is functioning normally with no service interruptions or downtime. We sincerely apologize for the inconvenience.

2013-03-28 Minor service interruptions

We are experiencing issues with the database that powers www.coursera.org, which is causing intermittent outages and latency issues. We will continue working to bring Coursera back into a stable state. Students and staff should still be able to access class.coursera.org.

Monday, March 18, 2013

2013-03-18 Service interruptions resolved

We have resolved the connectivity issues on the Coursera website. Assignment submissions should be good to go! A small number of students were affected, and we will be reaching out to them to resolve their problems. We apologize for any inconvenience caused to students and instructors, and we thank you for your patience.

2013-03-18 Minor Service Interruption

Earlier today, users were experiencing intermittent connectivity issues. This affected some users who were trying to submit quizzes and peer assessments on our website. We are currently monitoring the situation, and will post a further update once the problem is resolved.

Friday, March 8, 2013

2013-03-08: Amazon Network Issues

Amazon's Elastic Compute Cloud is currently experiencing network connectivity issues. Fortunately, Coursera is still up and running, although some students may experience increased latency. Although we operate in 3 availability zones (data centers) within the North Virginia region, the network issues appear to be affecting the whole region. For further information, please check on Amazon's status at: http://status.aws.amazon.com/.

Update: As of 10:51 PM PST, Amazon's network connectivity issues have been resolved.  All Coursera systems are operating normally at this time.