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# ENOTFOUND errors in production (ISR builds)

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Jonghun (@jonghun-3185) · 2025-12-02

Hi Vercel team,

I’m experiencing frequent ENOTFOUND DNS errors when fetching from
{API EndPoint} during ISR builds.

Error: getaddrinfo ENOTFOUND {API EndPoint}
Deployment: Prod / Preview Same as
Region: ICN1 (Seoul)
Frequency: \~30% of ISR builds fail

Details:

* Happens during cold starts

* More frequent during concurrent ISR builds

* Same code works fine locally

* Already implemented retry logic

  \[cause\]: \[Error: getaddrinfo ENOTFOUND {API EndPoint}\] {
    errno: -3008,
    code: 'ENOTFOUND',
    syscall: 'getaddrinfo',
    hostname: {API EndPoint}

Could you please investigate if there’s a DNS resolver issue
in the Seoul region?

Thank you!