ENOTFOUND errors in production (ISR builds)

Help
1

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!