Crossref incident

Intermittent 504 (Gateway time-out) status code errors on OAI-PMH queries

Crossref experienced a minor incident on July 23, 2025 affecting Plus OAI-PMH and OAI-PMH, lasting 20d. The incident has been resolved; the full update timeline is below.

Started: Jul 23, 2025, 07:12 PM UTC
Resolved: Aug 12, 2025, 07:47 PM UTC
Duration: 20d
Detected by Pingoru: Jul 23, 2025, 07:12 PM UTC

Affected components

Plus OAI-PMHOAI-PMH

Update timeline

investigating Jul 23, 2025, 07:12 PM UTC

We have had metadata users report that they are receiving intermittent 504 (Gateway time-out) status code errors on calls to OAI-PMH endpoints. We have been able to replicate and are currently investigating. -IF
investigating Jul 24, 2025, 03:28 PM UTC

We are continuing to investigate this issue.
investigating Jul 25, 2025, 08:40 PM UTC

We are continuing to investigate this issue.
identified Jul 28, 2025, 06:49 PM UTC

This issue has been identified and we'll be releasing a fix during tomorrow's maintenance window. -IF
identified Jul 30, 2025, 04:03 PM UTC

We are continuing to work on a fix for this issue.
monitoring Aug 06, 2025, 06:26 PM UTC

A fix has been implemented and we are monitoring the results.
monitoring Aug 08, 2025, 03:09 PM UTC

We believe our changes have solved this issue, but we're going to continue to monitor this over the weekend. -IF
resolved Aug 12, 2025, 07:47 PM UTC

This incident has been resolved.