next.config.ts:

import type { NextConfig } from "next";

const nextConfig: NextConfig = {
  allowedDevOrigins: [
    "http://localhost:3000",
    "http://127.0.0.1:3000",
    "http://100.117.174.45:3000",
  ],
};

export default nextConfig;

Logs after a hard restart:

> starter-for-nextjs@0.1.0 dev
> next dev --turbopack

   ▲ Next.js 15.3.5 (Turbopack)
   - Local:        http://localhost:3000
   - Network:      http://100.117.174.45:3000
   - Environments: .env.local

 ✓ Starting...
 ✓ Ready in 820ms
 ○ Compiling /signin ...
 ✓ Compiled /signin in 1183ms
 GET /signin 200 in 1443ms
 ⚠ Blocked cross-origin request from 100.117.174.45 to /_next/* resource. To allow this, configure "allowedDevOrigins" in next.config
Read more: https://nextjs.org/docs/app/api-reference/config/next-config-js/allowedDevOrigins
 ✓ Compiled /api/session in 222ms
 GET /api/session 401 in 268ms