We will be undergoing scheduled maintenance from Sunday, 18 August 20:00 UTC to Monday, 19 August 20:00 UTCTuesday, 20 August 20:00 UTC to Wednesday, 21 August 20:00 21:00 23:00 UTC (see Isaac’s note below).
The migration will require completedowntime, during which most Crossref services will be unavailable. Attempts to access these services, including making a metadata deposit, will receive a 500 error message, and you will need to retry when services are back online. We will not store or queue attempted metadata deposits or updates made during the downtime.
The completion of the migration will take place in a second upcoming downtime window of Monday 16-17th Sept 9pm-9pm UTC. Like before, most services will not be available. Please visit and subscribe to updates via this NEW status page notice: Crossref Status - Upcoming downtime to complete database migration, which also lists the components affected. Making a metadata deposit via any route will receive a 500 error message, and you should retry when services are back online. We will not store or queue attempted metadata deposits or updates made during the downtime. This downtime will not affect the resolution of Crossref DOI links, which will continue to work, nor the REST API for retrieving metadata.
We initiated the migration on 20th August and made significant progress in 24 hours. We are now ready to take the final steps and complete the process. We realise additional scheduled downtime may cause further disruption for our community, but this is critical work to move forward to a more robust, reliable, and modern infrastructure.
Starting now, the majority of Crossref tools and services are now down as we migrate our main database. We expect up to 24 hours of complete downtime from Monday, 16 September 21:00 UTC to Tuesday, 17 September 21:00 UTC.
During this time, most Crossref services will be unavailable:
Deposits, including helper tools like the Web Deposit Form
If you attempt to access these services, including making a metadata deposit, you’ll receive a 500 unavailable error message, and you will need to retry when these services are back online. We will not store or queue attempted metadata deposits or updates made during the downtime.
The REST API is not affected by this work and will remain available as normal.
Because of this downtime, our responses to you may be delayed over the next few days. We also expect that once we restore services late on Tuesday, 17 September that we’ll see a surge in submissions into our system, which will slow processing of metadata deposits and updates for the week as well.
We’ll be keeping this maintenance alert on our status page up to date. You can subscribe to updates at status.crossref.org.
Thanks for your patience. Our database migration is now complete and regular access to Crossref services has been restored. Several of our reports (browsable title list, conflict reports, depositor reports) remain offline - you can follow along on the progress to get them back up here. Other than that, this process is now finished.
If you have any questions please don’t hesitate to ask.