REST API (public pool only) maintenance - 4th April
In progress - Scheduled maintenance is currently in progress. We will provide updates as necessary.
Apr 04, 2025 - 01:00 UTC
Scheduled - Apologies, the maintenance is not underway - it has been moved to Friday 4th April 1am UTC.
Apr 4, 2025 01:00-11:00 UTC
In progress - Scheduled maintenance is currently in progress. We will provide updates as necessary.
Apr 03, 2025 - 09:59 UTC
Scheduled - The maintenance window has been moved to 1am UTC Friday 4th April. Indexing will be paused for 10 hours from then.
Apr 4, 2025 01:00-11:00 UTC
In progress - Scheduled maintenance is currently in progress. We will provide updates as necessary.
Apr 03, 2025 - 01:00 UTC
Scheduled - We will carry out essential maintenance on the public REST API in the coming hours. To enable this, indexing will be paused for approximately 10 hours from 01:00 UTC on 3 April. The API will remain available, but the latest changes to metadata will not be reflected. This will affect the public pool only. To access newly indexed works during this time, you can use the polite pool by including a mailto parameter in your requests.
Apr 4, 2025 01:00-11:00 UTC
Slower submission processing at doi.crossref.org
Update - Our technical team continues to investigate the cause of these performance lags. -IF
Apr 03, 2025 - 21:31 UTC
Update - We are continuing to investigate this issue.
Apr 02, 2025 - 20:43 UTC
Investigating - We reverted additional code earlier today during our weekly release in an attempt to pinpoint the origin of the performance lags in the submission and query queues at doi.crossref.org. Unfortunately, this did not result in a return to the processing speeds that we saw prior to 18 March. We have enabled additional processing threads for submissions and queries and continue to investigate the source of the lags. -IF
Apr 01, 2025 - 19:02 UTC
Update - We are continuing to monitor for any further issues.
Mar 31, 2025 - 17:07 UTC
Update - The emergency maintenance has now been completed. We have dedicated additional resources to drive down the backlog of pending submissions and queries in the queue at doi.crossref.org. -IF

Our changes have improved performance. We continue to monitor the results.
Mar 29, 2025 - 14:37 UTC
Monitoring - A fix has been implemented and we are monitoring the results.
Mar 29, 2025 - 13:58 UTC
Identified - We will be conducting emergency, unplanned maintenance tomorrow, Saturday, 29 March, from 11:00 to 14:00 UTC in order to address the slow processing times and a growing submission and query queue size. More details here: https://status.crossref.org/incidents/nxp3kkx4xxs3
Mar 28, 2025 - 17:51 UTC
Investigating - Unfortunately, today's special release has not resolved the issue. We're continuing to investigate the cause of the performance lags in the submission queue - doi.crossref.org. Resolving these lags is our technical team's highest priority. -IF
Mar 27, 2025 - 17:42 UTC
Update - We will be performing special maintenance - release v0.231.0 - tomorrow, 27 March, to try to further improve submission processing performance. -IF
Mar 26, 2025 - 19:56 UTC
Update - Our change yesterday improved performance in the submission queue - doi.crossref.org - for several hours, but we're seeing lags again today. We're investigating other potential causes of this issue. -IF
Mar 26, 2025 - 13:20 UTC
Update - The deployment earlier today did not fix the performance lags in our submission queue - doi.crossref.org. Our technical team has reverted a change that they believe is responsible for the lags. We're monitoring the results. -IF
Mar 25, 2025 - 17:38 UTC
Monitoring - We have observed slower processing times in our submission queue - doi.crossref.org - during the last few days. We've exceeded 50,000+ pending submissions at the moment. We're still processing your submissions. We're hopeful that today's deployment will fix the performance lags. We're monitoring the issue. -IF
Mar 25, 2025 - 14:13 UTC
Uptime over the past 90 days. View historical uptime.
APIs Under Maintenance
Public REST API ? Under Maintenance
Polite REST API ? Operational
OAI-PMH ? Operational
XML API ? Operational
Event Data Query API ? Operational
OpenURL ? Operational
Crossmark dialog server ? Operational
Public content negotiation ? Operational
Polite content negotiation ? Operational
Metadata Plus Operational
Plus REST API ? Operational
Plus OAI-PMH ? Operational
XML Snapshots ? Operational
JSON Snapshots ? Operational
Plus content negotiation ? Operational
Key Manager ? Operational
Content Registration Degraded Performance
Admin tool ? Degraded Performance
Test admin tool ? Degraded Performance
Web deposit form ? Degraded Performance
Record registration form ? Degraded Performance
Metadata files Operational
Open Funder Registry ? Operational
Retraction Watch ? Operational
Annual public data files ? Operational
Sites Operational
Crossref website ? Operational
Crossref support ? Operational
Metadata search ? Operational
Participation reports ? Operational
Integrations and external dependencies Operational
90 days ago
100.0 % uptime
Today
Handle servers ? Operational
Monitoring of iThenticate can be seen at https://turnitin.statuspage.io. Operational
AWS cloudfront Operational
ORCID Auto-update ? Operational
90 days ago
100.0 % uptime
Today
Meta Operational
deliberately-unreliable server ? Operational
Demo Auth ? Operational
Beta Degraded Performance
Metadata Manager ? Degraded Performance
Operational
Degraded Performance
Partial Outage
Major Outage
Maintenance
Major outage
Partial outage
No downtime recorded on this day.
No data exists for this day.
had a major outage.
had a partial outage.

No incidents or maintenance related to this downtime.

System Metrics Month Week Day
Public REST API Response Time
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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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Public Content Negotiation Response Time
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Public Content Negotiation Uptime
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Polite Content Negotiation Response Time
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Polite Content Negotiation Uptime
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Plus Content Negotiation Response Time
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Plus 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 Response Time
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Apr 4, 2025

Unresolved incident: REST API (public pool only) maintenance - 4th April.

Apr 3, 2025

Unresolved incident: Slower submission processing at doi.crossref.org.

Apr 2, 2025
Apr 1, 2025
1st April - weekly maintenance, release v0.228.0
Completed - The scheduled maintenance has been completed.
Apr 1, 16:00 UTC
In progress - Scheduled maintenance is currently in progress. We will provide updates as necessary.
Apr 1, 14:00 UTC
Scheduled - We will be undergoing scheduled maintenance - release version 0.228.0 - on 1 April 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.
Mar 31, 22:49 UTC
Mar 31, 2025
Mar 30, 2025

No incidents reported.

Mar 29, 2025
Turnitin Emergency Maintenance
Completed - The scheduled maintenance has been completed.
Mar 29, 15:30 UTC
In progress - Scheduled maintenance is currently in progress. We will provide updates as necessary.
Mar 29, 15:00 UTC
Scheduled - Turnitin will take an emergency 30-minute maintenance on Saturday, March 29 08:00 - 08:30 PDT / Saturday, March 29 15:00 - 15:30 GMT / Sunday, March 30 02:00 - 02:30 AEDT [go to https://tinyurl.com/4huywvd8 to find your local time]. Crossref's Similarity Check service will be impacted during this time.
Mar 25, 18:01 UTC
Emergency, unplanned maintenance, 29 March - 1100 to 1400 UTC
Completed - The scheduled maintenance has been completed.
Mar 29, 13:57 UTC
Update - We are continuing to verify that the maintenance was successful. -IF
Mar 29, 13:48 UTC
Verifying - Verification is currently underway for the maintenance items.
Mar 29, 13:39 UTC
Update - Our admin tool - doi.crossref.org - and other services are now back online. We're now accepting your submissions and will begin processing the backlog shortly. -IF
Mar 29, 13:37 UTC
Update - Our checks have passed and we're now bringing the system - doi.crossref.org and other services - back online. -IF
Mar 29, 13:12 UTC
Update - Emergency maintenance is still in progress. We've made the necessary changes in our database and our now performing checks before bringing our systems back online. -IF
Mar 29, 12:37 UTC
In progress - Scheduled maintenance is currently in progress. We will provide updates as necessary.
Mar 29, 11:00 UTC
Scheduled - We’re experiencing slow processing times and a growing submission and query queue size, with some days’ old submissions still queued. Attempts to tune the database to improve performance have not yet resolved the issue. Because of this, and in order to reduce the risk of further problems, we will be conducting emergency, unplanned maintenance tomorrow, Saturday, 29 March, from 11:00 to 14:00 UTC.

The emergency maintenance will require complete downtime, during which most Crossref services will be unavailable. Attempts to access these services, including making a metadata deposit, will receive an 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. This downtime will not affect the resolution of Crossref DOI links, which will continue to work, nor the REST API for retrieving metadata. We apologize for any disruption to registering your metadata, but we want to get these issues resolved ahead of the end of the month/quarter and push through the delayed submissions ASAP.

We will update this incident report throughout the maintenance window.
Mar 28, 17:22 UTC
Mar 28, 2025
Mar 27, 2025
27th March - weekly maintenance, release v0.231.0
Completed - The scheduled maintenance has been completed.
Mar 27, 16:00 UTC
In progress - Scheduled maintenance is currently in progress. We will provide updates as necessary.
Mar 27, 14:00 UTC
Scheduled - We will be undergoing special scheduled maintenance - release version 0.231.0 - on 27 March from 1400 to 1600 UTC to roll back issues related to submission processing lags. 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.
Mar 26, 19:05 UTC
Mar 26, 2025
Mar 25, 2025
25th March - weekly maintenance, release v0.230.0
Completed - The scheduled maintenance has been completed.
Mar 25, 14:47 UTC
In progress - Scheduled maintenance is currently in progress. We will provide updates as necessary.
Mar 25, 14:00 UTC
Scheduled - We will be undergoing scheduled maintenance - release version 0.230.0 - on 25 March 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.
Mar 24, 14:29 UTC
Mar 24, 2025

No incidents reported.

Mar 23, 2025

No incidents reported.

Mar 22, 2025

No incidents reported.

Mar 21, 2025

No incidents reported.

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