How to Fix: Can’t Compile Next.js 15.1.4 with Specific Network Connection

Next.js 15.1.4 can fail to compile on certain networks because the dev toolchain may try to resolve remote resources, perform dependency checks, or interact with package registries in ways that break behind VPNs, corporate proxies, custom DNS, or filtered TLS inspection. The result looks like a framework failure, but the real problem is usually a network-dependent step inside the local build pipeline.

Understanding the Root Cause

This issue typically appears when Next.js 15.1.4 is installed correctly, but the development server behaves differently depending on the active network connection. If the app compiles on one network and fails on another, that strongly suggests the problem is not your React code, but the environment around Node.js, package resolution, or local dev server dependencies.

In practice, several low-level causes can trigger this:

• Corporate proxy interception: HTTPS traffic is rewritten or inspected, causing requests used during dependency validation or package access to fail.
• Broken or filtered DNS: Registry hosts, telemetry endpoints, or transitive package sources may not resolve consistently.
• IPv6 routing problems: Your machine prefers IPv6 on one network, but that route is partially broken, leading to stalled or failed requests.
• Firewall restrictions: Local ports, loopback traffic, or child processes required by the dev server may be blocked.
• Inconsistent package installation: A package manager may have cached incomplete artifacts when the network was unstable, leaving node_modules in a bad state.

Although the GitHub issue points to create-next-app, the root cause is often not the scaffolding command itself. The network influences installation integrity, lockfile resolution, native package downloads, and runtime behavior. That is why switching Wi-Fi, tethering through a phone, or disabling VPN often changes the outcome immediately.

Step-by-Step Solution

Use the following sequence to isolate and fix the problem systematically.

1. Verify whether the issue is network-specific

Test the same project on a different connection such as mobile hotspot, home Wi-Fi, or a VPN-disabled session.

npm run dev

If the project works on another network, the failure is almost certainly caused by proxy, DNS, or routing policy rather than your application code.

2. Clear corrupted installation artifacts

Delete installed dependencies and the lockfile, then reinstall on a stable network.

rm -rf node_modules .next package-lock.json yarn.lock pnpm-lock.yaml
npm cache clean --force
npm install

Then retry:

npm run dev

3. Force Node.js to prefer IPv4

On some networks, IPv6 resolution succeeds first but routing fails later. Forcing IPv4 often fixes inconsistent startup and compile errors.

export NODE_OPTIONS="--dns-result-order=ipv4first"
npm run dev

On Windows PowerShell:

$env:NODE_OPTIONS="--dns-result-order=ipv4first"
npm run dev

If this resolves the issue, your network likely has partial or broken IPv6 support.

4. Configure proxy settings explicitly

If you are behind a corporate proxy, make sure npm and the shell environment both know about it.

npm config set proxy http://your-proxy-host:port
npm config set https-proxy http://your-proxy-host:port

You may also need:

export HTTP_PROXY=http://your-proxy-host:port
export HTTPS_PROXY=http://your-proxy-host:port

For PowerShell:

$env:HTTP_PROXY="http://your-proxy-host:port"
$env:HTTPS_PROXY="http://your-proxy-host:port"

If your organization uses TLS interception, install the internal CA certificate correctly instead of disabling SSL checks globally.

5. Validate registry access

Make sure your package manager is using a reachable registry and not a blocked mirror.

npm config get registry

If needed, reset it:

npm config set registry https://registry.npmjs.org/

Then reinstall dependencies:

npm install

6. Disable VPN or security middleware temporarily

Some VPN clients and endpoint protection tools interfere with local Node.js development. Temporarily disable them and rerun the server.

npm run dev

If this works, add exclusions for node, your project folder, and local development ports.

7. Test with a clean Next.js app

Create a fresh app to determine whether the issue is global or project-specific.

npx create-next-app@latest test-next-network-bug
cd test-next-network-bug
npm run dev

If even a clean app fails only on one network, you have confirmed an environment-level issue.

8. Lock your Node.js version

Use a supported Node.js LTS version to avoid compounding the network issue with runtime incompatibilities.

node -v
npm -v

If needed, switch versions with your version manager and reinstall:

nvm use 20
rm -rf node_modules .next
npm install
npm run dev

9. Capture verbose logs for confirmation

When the issue persists, collect logs to identify whether failure happens during dependency loading, DNS lookup, TLS handshake, or dev server startup.

npm run dev -- --verbose

You can also inspect environment-related values:

node -p "process.env.HTTP_PROXY"
node -p "process.env.HTTPS_PROXY"
node -p "process.version"

Recommended stable fix

In most real-world cases, the fastest reliable fix is:

1. Switch to a known-good network or disable VPN.
2. Delete node_modules, lockfiles, and .next.
3. Reinstall dependencies.
4. Set NODE_OPTIONS=–dns-result-order=ipv4first if the issue only appears on one ISP or office network.
5. Configure proxy and registry explicitly if working inside a managed enterprise network.

Common Edge Cases

• Works after install but fails during dev only: This often means package download succeeded, but runtime host resolution or a local websocket/dev overlay connection is being blocked.
• Only fails on office Wi-Fi: Corporate firewalls, SSL inspection, or restricted DNS are the most likely causes.
• Only fails with one package manager: Your npm, pnpm, or yarn config may point to different registries or caches.
• Intermittent success: Classic sign of flaky IPv6 routing, split-tunnel VPN behavior, or unstable DNS servers.
• Fresh project also fails: Confirms the problem is outside the application codebase.
• Mac works but Windows fails on same network: OS-specific proxy handling, certificate store differences, or shell environment variables may differ.

FAQ

1. Why does Next.js fail only on one network but work everywhere else?

Because the issue is usually tied to network policy, DNS resolution, proxy behavior, or IPv6 routing. Next.js itself is not inherently dependent on one Wi-Fi network, but its toolchain is sensitive to environment-level connectivity problems.

2. Is this a bug in Next.js 15.1.4 or a machine configuration problem?

It can surface as a Next.js 15.1.4 issue, but the underlying trigger is often environmental. If changing networks fixes it immediately, focus on proxy, firewall, DNS, certificate, and package cache diagnostics first.

3. What is the safest workaround if I need to keep working immediately?

Use a stable connection such as a mobile hotspot, clear and reinstall dependencies, and force IPv4 with NODE_OPTIONS=–dns-result-order=ipv4first. That combination resolves a large share of network-specific local build failures without changing application code.

If you are documenting this for your team, the most useful incident note is: Next.js 15.1.4 compile failures that depend on the active network are usually caused by proxy, DNS, TLS interception, or IPv6 path issues, not by the app source itself.