Fetch failed with UND_ERR_CONNECT_TIMEOUT and ECONNRESET error on Next.js serverless function on Vercel Production env

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After try the way in issue

Now I still meet same issue using @vercel/postgresin prod after add env VERCEL_UNDICI = 1 and redeploy.

Unhandled Rejection: NeonDbError: Error connecting to database: fetch failed at execute (/var/task/node_modules/@neondatabase/serverless/index.js:1548:25) at processTicksAndRejections (node:internal/process/task_queues:95:5) at runNextTicks (node:internal/process/task_queues:64:3) at process.processImmediate (node:internal/timers:454:9) at process.callbackTrampoline (node:internal/async_hooks:130:17) { severity: undefined, code: undefined, detail: undefined, hint: undefined, position: undefined, internalPosition: undefined, internalQuery: undefined, where: undefined, schema: undefined, table: undefined, column: undefined, dataType: undefined, constraint: undefined, file: undefined, line: undefined, routine: undefined, sourceError: TypeError: fetch failed at node:internal/deps/undici/undici:13178:13 at processTicksAndRejections (node:internal/process/task_queues:95:5) at runNextTicks (node:internal/process/task_queues:64:3) at process.processImmediate (node:internal/timers:454:9) at process.callbackTrampoline (node:internal/async_hooks:130:17) at async execute (/var/task/node_modules/@neondatabase/serverless/index.js:1547:21) { [cause]: ConnectTimeoutError: Connect Timeout Error (attempted addresses: 100.26.116.133:443) at onConnectTimeout (node:internal/deps/undici/undici:2331:28) at node:internal/deps/undici/undici:2283:50 at Immediate._onImmediate (node:internal/deps/undici/undici:2315:13) at process.processImmediate (node:internal/timers:483:21) at process.callbackTrampoline (node:internal/async_hooks:130:17) { code: 'UND_ERR_CONNECT_TIMEOUT' } } } Node.js process exited with exit status: 128. The logs above can help with debugging the issue.

Unhandled Rejection: NeonDbError: Error connecting to database: fetch failed
    at execute (/var/task/node_modules/@neondatabase/serverless/index.js:1548:25)
    at process.processTicksAndRejections (node:internal/process/task_queues:95:5) {
  severity: undefined,
  code: undefined,
  detail: undefined,
  hint: undefined,
  position: undefined,
  internalPosition: undefined,
  internalQuery: undefined,
  where: undefined,
  schema: undefined,
  table: undefined,
  column: undefined,
  dataType: undefined,
  constraint: undefined,
  file: undefined,
  line: undefined,
  routine: undefined,
  sourceError: TypeError: fetch failed
      at /opt/rust/undici.js:40:5166
      at process.processTicksAndRejections (node:internal/process/task_queues:95:5)
      at async execute (/var/task/node_modules/@neondatabase/serverless/index.js:1547:21) {
    [cause]: Error: Client network socket disconnected before secure TLS connection was established
        at TLSSocket.onConnectEnd (node:_tls_wrap:1738:19)
        at TLSSocket.emit (node:events:531:35)
        at endReadableNT (node:internal/streams/readable:1696:12)
        at process.processTicksAndRejections (node:internal/process/task_queues:82:21) {
      code: 'ECONNRESET',
      path: undefined,
      host: 'api.us-east-1.aws.neon.tech',
      port: 443,
      localAddress: null
    }
  }
}

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Hi, @doodlesomething! Welcome to the Vercel Community :smile:

It would be helpful to get a minimal reproducible example for us to dig deeper on. Could you create one for us?