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- ID :
- 492
- Titre :
- Random timeouts with Cloudflare
- Statut :
-
terminé
- Date de début :
- 26/03/2026 08:34
- Date de fin :
- 27/03/2026 11:41
- Datacenters concernés :
-
Paris 1 (France)
Mises à jour
8:38
We’ve had several reports from clients that are experiencing random timeout issues with their site hosted behind Cloudflare.
It seems to have started around 2026-03-23 at 19:00 UTC.
Causes are still unclear but we suspect it might be due to a change from Cloudflare. We’re investigating.
10:13
As a temporary workaround, clients can disabling HTTP/2 to Origin from Cloudflare’s dashboard.
19:09
We have identified and reproduced the root cause of the issue. Cloudflare has modified the way they transmit certain HTTP/2 frames. Specifically, requests without a body are now occasionally sent with a HEADERS frame that does not include the END_STREAM flag. This is followed immediately by an empty DATA frame containing the END_STREAM flag.
This behavior appears to be intermittent, affecting approximately 5% to 10% of requests routed through Cloudflare. Our current HTTP stack does not handle this sequence correctly, and we are actively working on a fix.
11:41
Cloudflare has finally reverted their faulty change around 2026-03-26 at 23:50 UTC after complaints from their customers.
Customers that had disabled HTTP/2 as a temporary fix can now re-enable it from their Cloudflare’s dashboard.
A change to our HTTP stack to prevent this issue from causing trouble will be deployed in the next few days.