# App requests hang forever in development: The network connection was lost

> The API base URL pointed at a Tailscale address, but the phone was not on the tailnet.

Web page: https://davidewins.com/errors/phone-cannot-reach-tailscale-api-url

React Native. Confirmed fix, 25 September 2026.

Versions: Expo dev client, Tailscale

Error:

```
The network connection was lost
```

## Cause

The API base URL pointed at a Tailscale address, but the phone was not on the tailnet. Metro still worked because the dev client used the LAN address, and the fetch wrapper had no timeout, so every call hung until iOS gave up.

## Fix

Use the Mac's LAN IP (or put the phone on the tailnet), restart Metro with `--clear`, and give every fetch a timeout via AbortController.

## More React Native errors

- [Screen crashes the whole app: Rendered more hooks than during the previous render](https://davidewins.com/errors/rules-of-hooks-usememo-after-early-return)
- [Feed shows an error state for every address: ReferenceError before initialization](https://davidewins.com/errors/tdz-const-used-in-map-before-declaration)
- [Screen crash: Maximum update depth exceeded](https://davidewins.com/errors/maximum-update-depth-competing-effects)
- [Reanimated crash on device: Tried to synchronously call a non-worklet function on the UI thread](https://davidewins.com/errors/worklet-calls-non-worklet-helper)
- [Rows wrapped in <Link asChild> collapse to a tiny height](https://davidewins.com/errors/link-aschild-function-style-dropped)

[Search all errors](https://davidewins.com/errors)