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This page lists issues we already know about. Seeing something else? Email team@paperdigest.org.
Past Incidents
2026
09/14/2026
Daily DigestarXiv API service was down, so newly released arXiv papers were not included in that day's daily digest. Resolved at 00:29:30 on 09/15/2026.
03/06/2026
BlogFrom 14:10 on 03/06/2026 we saw degraded performance on our blog site. Resolved at 08:00 on 03/07/2026.
01/22/2026
EmailFrom 14:07, our email service experienced connection issues due to a Microsoft email service outage. This issue has been resolved.
2025
12/28/2025
WebsiteFrom 06:48, the website experienced connection issues. Resolved at 07:11.
10/13/2025
Daily DigestThat day's daily digest was delayed by 6 hours.
03/06/2025
WebsiteFrom 08:55, the website experienced connection issues. Resolved at 09:10.
02/04/2025
Daily DigestThe arXiv export service did not release new papers as usual. As a result, we did not send daily digests to users whose selected interests are covered by arXiv. Daily digests for 02/04 became available online once arXiv released the papers.
2024
12/19/2024
Daily DigestSome files on bioRxiv and medRxiv could not be accessed.
12/03/2024
Daily DigestThe arXiv export service did not release new papers as usual. As a result, we did not send daily digests to users whose selected interests are covered by arXiv. Daily digests for 12/03 became available online once arXiv released the papers.
11/26/2024
Main siteAt 07:18 the main site began experiencing connection issues. Resolved at 07:31.
11/25/2024
EmailOne of our email providers, Microsoft 365, experienced an outage, delaying some emails sent via Office 365. We monitored the situation to make sure all account creation confirmation emails were delivered.
11/15/2024
Paper lookupFrom earlier on 11/15, one server serving the paper details page was unreachable, so affected users saw an empty page. Addressed at 08:00 on 11/15.
11/04/2024
Daily DigestThe arXiv export service did not release new papers as usual. As a result, we did not send daily digests to users whose selected interests are covered by arXiv. Daily digests for 11/04 became available online once arXiv released the papers.
10/09/2024
Daily DigestThe arXiv export service did not release new papers as usual, due to maintenance. As a result, we did not send daily digests to users whose selected interests are covered by arXiv. Daily digests for 10/09 became available online once arXiv released the papers.
10/02/2024
Daily DigestThe arXiv export service did not release new papers as usual. As a result, we did not send daily digests to users whose selected interests are covered by arXiv. Daily digests for 10/02 became available online once arXiv released the papers.
09/20/2024 – 09/25/2024
Daily DigestThe arXiv export service was down across 09/20, 09/23, 09/24 and 09/25. As a result, we did not send daily digests to users whose selected interests are covered by arXiv. Daily digests for these days are available online.
09/04/2024
Daily DigestThe arXiv export service did not release new papers as usual. As a result, we did not send daily digests to users whose selected interests are covered by arXiv. Daily digests for 09/04 became available online once arXiv released the papers.
08/02/2024
Daily DigestThe arXiv export service did not release new papers as usual. As a result, we did not send daily digests to users whose selected interests are covered by arXiv. Daily digests for 08/02 became available online once arXiv released the papers.
07/12/2024
Daily DigestThe arXiv export service did not release new papers as usual. As a result, we did not send daily digests to users whose selected interests are covered by arXiv. Daily digests for 07/12 became available online once arXiv released the papers.
07/02/2024
Daily DigestThe arXiv export service did not release new papers as usual. As a result, we did not send daily digests to users whose selected interests are covered by arXiv. Daily digests for 07/02 became available online once arXiv released the papers.
06/04/2024
Daily DigestThe arXiv export service did not release new papers as usual. As a result, we did not send daily digests to users whose selected interests are covered by arXiv. Daily digests for 06/04 became available online once arXiv released the papers.
05/30/2024
WebsiteAt around 09:00 our domain name registrar accidentally reset our DNS entry, making the website inaccessible until around 11:00. This was addressed the same day, though some users continued to see the problem while the DNS record propagated.
04/17/2024
Daily DigestAbout 100 daily digest emails to the pku.edu.cn domain were not delivered because of an SPF matching issue that did not appear to be on our side. Resolved on 04/18.
04/09/2024
ServicesThe website began experiencing access issues at 08:58. Services came back at 09:39.
04/02/2024 – 04/03/2024
Daily DigestThe arXiv export service did not release new papers as usual. As a result, we did not send daily digests to users whose selected interests are covered by arXiv. Daily digests for 04/02 and 04/03 are available online.
03/31/2024
Account ManagementA number of account creation confirmation emails sent to Yahoo addresses were not delivered in time. Addressed the same day.
01/12/2024
Daily DigestThe arXiv export service did not release new papers as usual, so we did not generate daily digests for users whose selected interests are partially covered by arXiv. That day's digest became available online once the issue was fixed on the arXiv side.
01/02/2024
Daily DigestThe arXiv export service did not release new papers as usual, so we did not generate daily digests for users whose selected interests are partially covered by arXiv. That day's digest became available online once the issue was fixed on the arXiv side.
2023
10/16/2023 – 10/17/2023
Daily DigestThe arXiv export API had been unstable since 10/16, so we struggled to download new papers and did not send digest emails on 10/16 and 10/17. Digests for these days are available online. arXiv notified us that the issue was resolved.
09/30/2023
Text RewriterThe text rewriter service went down at around 10:20 due to cloud hardware errors. Service returned at around 11:20.
05/07/2023
ServicesAt 10:00 the website began experiencing connection issues. The site came back at 11:05.