diff --git a/bun.lock b/bun.lock
index 044671dd..83407c53 100644
--- a/bun.lock
+++ b/bun.lock
@@ -357,7 +357,7 @@
     },
     "packages/dev-server": {
       "name": "@wrnexus/dev-server",
-      "version": "0.8.58",
+      "version": "0.8.59",
       "dependencies": {
         "@wrnexus/authz": "workspace:*",
         "@wrnexus/cache": "workspace:*",
diff --git a/packages/dev-server/package.json b/packages/dev-server/package.json
index 95541951..1e26657c 100644
--- a/packages/dev-server/package.json
+++ b/packages/dev-server/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@wrnexus/dev-server",
-  "version": "0.8.58",
+  "version": "0.8.59",
   "type": "module",
   "main": "src/index.ts",
   "exports": {
diff --git a/packages/dev-server/src/gateway.ts b/packages/dev-server/src/gateway.ts
index 2cf4bb8b..5d0bf45f 100644
--- a/packages/dev-server/src/gateway.ts
+++ b/packages/dev-server/src/gateway.ts
@@ -654,6 +654,8 @@ export async function startGateway(opts: GatewayOptions): Promise<RunningGateway
       port,
       hostname,
       development: mode === "development",
+      // Keep the socket alive long enough to return the configured proxy timeout.
+      idleTimeout: Math.min(255, Math.max(35, Math.ceil((limits.timeoutMs ?? 30_000) / 1000) + 5)),
       maxRequestBodySize: maxBodyBytes,
       async fetch(req, srv) {
         const url = new URL(req.url);
diff --git a/packages/dev-server/src/index.ts b/packages/dev-server/src/index.ts
index 2b953310..4dcd8b1d 100644
--- a/packages/dev-server/src/index.ts
+++ b/packages/dev-server/src/index.ts
@@ -634,6 +634,8 @@ export async function startServer(opts: ServeOptions): Promise<RunningServer> {
     port,
     hostname,
     development: mode === "development",
+    // Cold page compilation can exceed Bun's default connection idle window.
+    idleTimeout: 35,
     maxRequestBodySize: 10 * 1024 * 1024,
     ...(opts.tls ? { tls: opts.tls } : {}),
     fetch(request, server) {