diff --git a/frontend/README.md b/frontend/README.md
index 09e5074..0f0a32f 100644
--- a/frontend/README.md
+++ b/frontend/README.md
@@ -157,8 +157,11 @@ Clerk should be **off** unless you set a real `pk_test_...` or `pk_live_...` pub
 
 ### Dev server blocked by origin restrictions
 
-`next.config.ts` sets:
+`next.config.ts` sets `allowedDevOrigins` for dev proxy safety.
 
-- `allowedDevOrigins: ["192.168.1.101"]`
+If you see repeated proxy errors (often `ECONNRESET`), make sure your dev server hostname and browser URL match (e.g. `localhost` vs `127.0.0.1`), and that your origin is included in `allowedDevOrigins`.
 
-If you’re developing from a different hostname/IP, you may need to update `allowedDevOrigins` (or use `npm run dev` on localhost).
+Notes:
+- Local dev should work via `http://localhost:3000` and `http://127.0.0.1:3000`.
+- LAN dev should work via the configured LAN IP (e.g. `http://192.168.1.101:3000`) **only** if you bind the dev server to all interfaces (`npm run dev:lan`).
+- If you bind Next to `127.0.0.1` only, remote LAN clients won’t connect.
diff --git a/frontend/next.config.ts b/frontend/next.config.ts
index e594f65..8c034bc 100644
--- a/frontend/next.config.ts
+++ b/frontend/next.config.ts
@@ -1,7 +1,11 @@
 import type { NextConfig } from "next";
 
 const nextConfig: NextConfig = {
-  allowedDevOrigins: ["192.168.1.101"],
+  // In dev, Next may proxy requests based on the request origin/host.
+  // Allow common local origins so `next dev --hostname 127.0.0.1` works
+  // when users access via http://localhost:3000 or http://127.0.0.1:3000.
+  // Keep the LAN IP as well for dev on the local network.
+  allowedDevOrigins: ["192.168.1.101", "localhost", "127.0.0.1"],
   images: {
     remotePatterns: [
       {