Intermittent failures: Error performing request to SDK URL:

1

Hey folks :waving_hand:

I’m running a backend service on Render that uses Inngest for background jobs, and over the last ~month I’ve started seeing intermittent failures that look like this:

Error performing request to SDK URL:
Post "https://{service}.onrender.com/inngest/register?fnId={pdf-parse-function}&stepId={step}":
dial tcp [64:ff9b::d818:39fb]:443: i/o timeout

A few important details / observations:

  • This is intermittent, not consistent

    • Same service, same endpoint

    • Some Inngest runs succeed, others fail minutes apart

  • Failures appear during the Inngest SDK registration / handshake, before function logic runs

  • The IP (64:ff9b::/96) looks like a NAT64 / IPv6-mapped address

  • No correlation with load, concurrency, or deploys

  • Increasing timeouts / retries inside the function does not help (this happens before execution)

What’s confusing is:

  • This setup worked reliably before

  • Nothing significant changed on our side when this started

Any Ideas how I can go ahead debugging this.

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