Crossref Status

Update - We are continuing to investigate this issue.
Oct 21, 13:00 UTC

Update - We are continuing to investigate this issue which also includes the Polite REST API pool which participation reports and other tools use
Oct 21, 12:59 UTC

Investigating - Participation reports are currently down and we're investigating as soon as we can.
Oct 21, 12:56 UTC

APIs Operational

Public REST API Operational

Polite REST API Operational

OAI-PMH Operational

XML API Operational

Event Data Query API Operational

OpenURL Operational

Crossmark dialog server Operational

Content negotiation Operational

Metadata Plus Operational

Plus REST API Operational

Plus OAI-PMH Operational

XML Snapshots Operational

JSON Snapshots Operational

Sites Operational

Crossref website Operational

Crossref support Operational

Metadata search Operational

Participation reports Operational

Content Registration Operational

Admin tool Operational

Test admin tool Operational

External dependencies Operational

Handle servers Operational

Similarity Check via iThenticate from Turnitin - status found at https://turnitin.statuspage.io/ Operational

AWS cloudfront Operational

Meta Operational

deliberately-unreliable server Operational

Demo Auth Operational

Beta Operational

Metadata Manager Operational

Operational

Degraded Performance

Partial Outage

Major Outage

Maintenance

System Metrics Month Week Day

Public REST API Response Time

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Public REST API Uptime

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Polite REST API Response Time

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Polite REST API Uptime

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Plus REST API Response Time

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Plus REST API Uptime

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Plus OAI-PMH Response Time

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Plus OAI-PMH Uptime

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OpenURL Response Time

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OpenURL Uptime

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Content Negotiation Response Time

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Content Negotiation Uptime

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Crossmark Response Time

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Crossmark Uptime

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Event Data Query API Response Time

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Event Data Query API Uptime

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Crossref Metadata Search

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Past Incidents

Oct 24, 2021

No incidents reported today.

Oct 23, 2021

No incidents reported.

Oct 22, 2021

No incidents reported.

Oct 21, 2021

21 October - Hardware testing at our data center

Completed - Hardware testing is complete. There were 3 brief outages during the testing where Crossref services were not available.
Oct 21, 20:58 UTC

In progress - Scheduled maintenance is currently in progress. We will provide updates as necessary.
Oct 21, 19:00 UTC

Scheduled - We will be performing hardware testing at our data center on Thursday, 21 October from 1900 to 2100 UTC. While we're hopeful there will be no downtime, users may experience intermittent outages during this window of time.
Oct 19, 15:14 UTC

21 October - unscheduled maintenance, release v0.100.1

Completed - The scheduled maintenance has been completed.
Oct 21, 17:00 UTC

In progress - Scheduled maintenance is currently in progress. We will provide updates as necessary.
Oct 21, 15:01 UTC

Scheduled - Unfortunately we discovered a few problems with release v0.100.0 and had to roll it back. We will therefore be undergoing unscheduled maintenance today (Thursday 21 October) from 1500 to 1700 UTC for release v0.100.1

Our members may experience delays in deposit system admin tool (doi.crossref.org) processing. Deposits submitted during this time will be stored and processed after the maintenance has been completed
Oct 21, 13:57 UTC

Slower processing in the admin tool (doi.crossref.org) today

Resolved - The issue has been resolved and the queue looks back to normal once more.
Oct 21, 08:05 UTC

Identified - The issue has been identified and a fix is being implemented.
Oct 20, 19:34 UTC

Investigating - We are still investigating the root cause of these submission processing delays.
Oct 20, 17:43 UTC

Monitoring - A fix has been implemented, and submission processing has resumed at doi.crossref.org. We continue to monitor.
Oct 18, 17:44 UTC

Update - We have suspended the queue and are restarting the database and all processing threads. We continue to accept submissions during this time, but processing will be delayed.
Oct 18, 15:36 UTC

Update - We're suspending the queue shortly to address the issue of stalling threads. We'll continue to accept your submissions during this time, but there will be a processing lag as a result.
Oct 18, 14:51 UTC

Investigating - Over the course of the last week, we've had a few instances of submission processing threads stalling. We have another example of this today. We're investigating the underlying issue. We continue to accept and process submissions during this time, but this recurring issue continues to result in slower processing times.
Oct 18, 14:30 UTC

Monitoring - A fix has been implemented and we are monitoring the results.
Oct 15, 17:09 UTC

Investigating - We look to have stalled processing threads in the admin tool (doi.crossref.org) causing additional delays at the moment. We're investigating.
Oct 15, 14:20 UTC

Update - We have re-enabled the queue. Submissions are now processing. Yay! We continue to monitor the queue and your submissions.
Oct 13, 17:03 UTC

Update - We will be pausing the submission queue (doi.crossref.org) shortly to remove ~10,000 submissions that one of our members flagged as containing metadata errors. All submissions sent to us during this time will be stored and processed as soon as the erroneous submissions have been removed and the queue reactivated.
Oct 13, 16:32 UTC

Monitoring - A fixed has been implemented. Submissions are now processing in our admin tool (doi.crossref.org). We continue to monitor the results.
Oct 12, 20:43 UTC

Identified - The issue has been identified and a fix is being implemented.
Oct 12, 19:49 UTC

Investigating - We look to have stalled processing threads in the admin tool (doi.crossref.org) causing additional delays. We're investigating.
Oct 12, 19:16 UTC

Monitoring - Submission processing in the queue is in much better shape today than last week. We have ~27,000 pending submissions in the queue - as of this writing - compared to 75,000+ at several points last week. The current issue is that several users have very large file sizes for book registrations and reference list updates working their way through the queue (these larger submissions require more time for us to match references against and process). Given the logic in submission processing in the queue, those larger submissions are largely affecting other larger submissions. Instead of a general backlog, like we had last week, we currently have a backlog in submissions of very large file sizes. Thankfully, for members submitting smaller file sizes, you will likely not notice any significant lags in submission processing.
Oct 11, 19:35 UTC

Identified - Due to yesterday's outage - https://www.crossref.org/blog/outage-of-october-6-2021/ - we will need to reprocess all submissions that were processed between 1400 and 1900 UTC yesterday, 6 October. This will result in additional submissions into the queue, which is already delayed. We will be begin reprocessing these submissions imminently.
Oct 7, 17:14 UTC

Monitoring - A fix has been implemented and we are monitoring the results.
Oct 4, 18:16 UTC

Identified - The issue has been identified and a fix is being implemented.
Oct 4, 14:49 UTC

Investigating - Processing of submissions in the admin tool (doi.crossref.org) is slower than we would like today. We are storing all submissions sent to us and are processing them as fast as we can, but there is a noticeable backlog at the moment. We're investigating.
Oct 4, 14:29 UTC

Oct 20, 2021

Oct 19, 2021

No incidents reported.

Oct 18, 2021

REST API polite pool and Participation Reports were down for an hour earlier today

Resolved - This incident has been resolved.
Oct 18, 14:00 UTC

Monitoring - Our REST API Polite pool and Participation Reports were down for an hour from around 1020 UTC today, but are operational again now.

Those using the REST API Public or Plus pools were unaffected.

The team are investigating the cause and we'll update with more information as soon as we have it.
Oct 18, 11:28 UTC

Oct 17, 2021

No incidents reported.

Oct 16, 2021

No incidents reported.

Oct 15, 2021

Oct 14, 2021

No incidents reported.

Oct 13, 2021

Content negotiation switchover to REST API - Wednesday, 13 October

Completed - The scheduled maintenance has been completed.
Oct 13, 17:00 UTC

Verifying - Verification is currently underway for the maintenance items.
Oct 13, 16:16 UTC

In progress - Scheduled maintenance is currently in progress. We will provide updates as necessary.
Oct 13, 16:00 UTC

Scheduled - On 13 October, we will be making backend changes to our content negotiation service, effectively folding it into our REST API. While behavior should be unchanged for requests made according to the specification, there are a few functional changes to note.
1) The resolver URL will change from http://data.crossref.org to https://api.crossref.org
2) Content negotiation responses will be returned by one of our three API pools depending on whether you include mailto identification in your user agent header for the polite pool, or include a token for Metadata Plus subscribers accessing the Plus pool. All other requests will be serviced by the public pool.
Oct 12, 18:26 UTC

Oct 12, 2021

12 October - weekly maintenance, release v0.100.0

Completed - The scheduled maintenance has been completed.
Oct 12, 15:11 UTC

In progress - Scheduled maintenance is currently in progress. We will provide updates as necessary.
Oct 12, 14:00 UTC

Scheduled - We will be undergoing scheduled maintenance - release v0.100.0 - on Tuesday, 12 October from 1400 to 1600 UTC. Our members may experience delays in deposit system admin tool (doi.crossref.org) processing. Deposits submitted during this time will be stored and processed after the maintenance has been completed.
Oct 11, 15:41 UTC

Oct 11, 2021

Event Data service not adding new events since 01:15 UTC on 10th October

Resolved - Missing events from yesterday are now back in Event Data, so we're resolving the incident.
Oct 11, 11:53 UTC

Monitoring - Event Data is now adding new events again. We'll continue monitoring to make sure any missed events have been successfully added.
Oct 10, 17:44 UTC

Investigating - The Event Data service has been having problems adding new events to the API since 0115 UTC today. The API itself is stable, but new events are not being added. Our team are investigating and we’ll update as soon as we know more.
Oct 10, 16:16 UTC

Oct 10, 2021

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