UPDATE: Issues resolved.
As of 7:15pm the DNS issues were resolved. ITS continues to investigate the root cause, but vanity domains and publishing should be back to normal. We are attempting to republish any items that failed to publish this evening, but if you are still not seeing the changes you expected to on your live website, please try publishing to the live server again.
Original Message
Yale ITS has been experiencing widespread DNS issues since mid-afternoon, causing multiple problems with YSM websites and infrastructure. Most noticeably, vanity domains (such as http://web.yale.edu) are not currently working when connected to the Yale network from your office or via VPN. Any visitors from outside the Yale network will not experience any issues accessing the sites.
If you are on a Yale computer or VPN and need to view your site, you can still do so by visiting your site via it's http://medicine.yale.edu address. For example, the equivalent "medicine" URL for http://surgery.yale.edu is https://medicine.yale.edu/surgery/. If you do not know the "medicine" URL for your site please email ysm.editor@yale.edu and we will provide it to you.
In addition, because of these DNS issues website editors cannot currently publish to the live server. Any transactions sent to the live server will currently fail, so please keep an eye on the publishing queue. You can still edit your websites and publish to the preview server, just be sure to go back later on to publish your pages live if necessary. This problem has highlighted another benefit of moving Tridion (http://edit.yale.edu) to the cloud, in which case publishing live would still be possible. We began working on a test instance of Tridion on the Microsoft Azure cloud this week.
We will update this article with further information as it becomes available from ITS.