diff --git a/e2e/cases/cli/reload-config/index.test.ts b/e2e/cases/cli/reload-config/index.test.ts
index be1e7e8a9c..e6353f3532 100644
--- a/e2e/cases/cli/reload-config/index.test.ts
+++ b/e2e/cases/cli/reload-config/index.test.ts
@@ -24,7 +24,7 @@ test('should restart dev server and reload config when config file changed', asy
           root: 'dist',
         },
       },
-      server: { port: ${getRandomPort()} }
+      server: { port: ${await getRandomPort()} }
     };`,
   );
 
@@ -45,7 +45,7 @@ test('should restart dev server and reload config when config file changed', asy
           root: 'dist-2',
         },
       },
-      server: { port: ${getRandomPort()} }
+      server: { port: ${await getRandomPort()} }
     };`,
   );
 
diff --git a/e2e/cases/cli/reload-env/index.test.ts b/e2e/cases/cli/reload-env/index.test.ts
index e85976f595..b21832d3f0 100644
--- a/e2e/cases/cli/reload-env/index.test.ts
+++ b/e2e/cases/cli/reload-env/index.test.ts
@@ -25,7 +25,7 @@ test.skip('should restart dev server when .env file is changed', async () => {
       output: {
         disableFilenameHash: true,
       },
-      server: { port: ${getRandomPort()} }
+      server: { port: ${await getRandomPort()} }
     };`,
   );
 
diff --git a/e2e/cases/preview/index.test.ts b/e2e/cases/preview/index.test.ts
index fc23944798..bc7388266b 100644
--- a/e2e/cases/preview/index.test.ts
+++ b/e2e/cases/preview/index.test.ts
@@ -24,7 +24,7 @@ test('should allow plugin to modify preview server config', async ({
   page,
 }) => {
   const cwd = join(__dirname, 'basic');
-  const PORT = getRandomPort();
+  const PORT = await getRandomPort();
 
   const plugin: RsbuildPlugin = {
     name: 'test',
diff --git a/e2e/package.json b/e2e/package.json
index 6fcc7d2134..e6658f8a4b 100644
--- a/e2e/package.json
+++ b/e2e/package.json
@@ -30,10 +30,10 @@
     "@rsbuild/plugin-pug": "workspace:*",
     "@rsbuild/plugin-react": "workspace:*",
     "@rsbuild/plugin-rem": "workspace:*",
-    "@rsbuild/plugin-stylus": "workspace:*",
     "@rsbuild/plugin-solid": "workspace:*",
     "@rsbuild/plugin-source-build": "workspace:*",
     "@rsbuild/plugin-styled-components": "workspace:*",
+    "@rsbuild/plugin-stylus": "workspace:*",
     "@rsbuild/plugin-svelte": "workspace:*",
     "@rsbuild/plugin-svgr": "workspace:*",
     "@rsbuild/plugin-swc": "workspace:*",
diff --git a/e2e/scripts/shared.ts b/e2e/scripts/shared.ts
index bf037f3b32..83e0a240ff 100644
--- a/e2e/scripts/shared.ts
+++ b/e2e/scripts/shared.ts
@@ -1,3 +1,4 @@
+import net from 'net';
 import { URL } from 'url';
 import assert from 'assert';
 import { join } from 'path';
@@ -73,16 +74,34 @@ export const createRsbuild = async (
   return rsbuild;
 };
 
+function isPortAvailable(port: number) {
+  const server = net.createServer().listen(port);
+  return new Promise((resolve, reject) => {
+    server.on('listening', () => {
+      server.close();
+      resolve(true);
+    });
+
+    server.on('error', (err: { code: string }) => {
+      if (err.code === 'EADDRINUSE') {
+        resolve(false);
+      } else {
+        reject(err);
+      }
+    });
+  });
+}
+
 const portMap = new Map();
 
 // Available port ranges: 1024 ～ 65535
 // `10080` is not available in CI, so we start with `11000`.
-export function getRandomPort(
+export async function getRandomPort(
   defaultPort = Math.ceil(Math.random() * 50000) + 11000,
 ) {
   let port = defaultPort;
   while (true) {
-    if (!portMap.get(port)) {
+    if (!portMap.get(port) && (await isPortAvailable(port))) {
       portMap.set(port, 1);
       return port;
     } else {
@@ -105,7 +124,7 @@ const updateConfigForTest = async (
   // make devPort random to avoid port conflict
   config.server = {
     ...(config.server || {}),
-    port: getRandomPort(config.server?.port),
+    port: await getRandomPort(config.server?.port),
   };
 
   config.dev ??= {};