Cloudflare was suffering an outage Sunday morning that appeared to be affecting multiple websites.

The outage began early Sunday, and according to Cloudflare’s status page, it was seeing “an increased level of HTTP 5xx class errors,” such as 522 and 503, which indicates an issue with the server. In a later update Cloudflare said it had “identified an issue with a transit provider” as the cause of the issue, and that it was working on a fix. The outage was affecting all data centers that use the transit provider.

Cloudflare’s services are meant to prevent websites from suffering outages due to peak traffic loads as well as DDoS or spam comment attacks. DownDetector showed Sunday’s outage was affecting the US and parts of western Europe, and sites including Discord, Hulu, Feedly, and dozens of others appeared to be affected.

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