diff --git a/backend/scripts/testWebSocket.js b/backend/scripts/testWebSocket.js
index 2481551..13d2caf 100644
--- a/backend/scripts/testWebSocket.js
+++ b/backend/scripts/testWebSocket.js
@@ -33,12 +33,14 @@ const pollingReq = http.get(pollingUrl, (res) => {
       console.log(`   Response: ${data.substring(0, 200)}...`);
       
       // Versuche Session-ID zu extrahieren
+      let sessionId = null;
       try {
         const jsonMatch = data.match(/\{.*\}/);
         if (jsonMatch) {
           const json = JSON.parse(jsonMatch[0]);
           if (json.sid) {
-            console.log(`   Session ID: ${json.sid}`);
+            sessionId = json.sid;
+            console.log(`   Session ID: ${sessionId}`);
           }
         }
       } catch (e) {
@@ -47,7 +49,7 @@ const pollingReq = http.get(pollingUrl, (res) => {
       
       // Test 2: WebSocket-Upgrade
       console.log('\n2️⃣ Teste WebSocket-Upgrade...');
-      testWebSocketUpgrade(host, port);
+      testWebSocketUpgrade(host, port, sessionId);
     } else {
       console.error(`   ❌ HTTP-Polling fehlgeschlagen: Status ${res.statusCode}`);
       process.exit(1);
@@ -71,14 +73,17 @@ pollingReq.setTimeout(5000, () => {
   process.exit(1);
 });
 
-function testWebSocketUpgrade(host, port) {
+function testWebSocketUpgrade(host, port, sessionId) {
   // WebSocket-Upgrade-Request
   const wsKey = Buffer.from(Math.random().toString()).toString('base64').substring(0, 16);
+  const path = sessionId 
+    ? `/socket.io/?EIO=4&transport=websocket&sid=${sessionId}`
+    : '/socket.io/?EIO=4&transport=websocket';
   
   const options = {
     hostname: host,
     port: port,
-    path: '/socket.io/?EIO=4&transport=websocket',
+    path: path,
     method: 'GET',
     headers: {
       'Upgrade': 'websocket',
@@ -100,8 +105,22 @@ function testWebSocketUpgrade(host, port) {
     } else {
       console.log(`   ⚠️  WebSocket-Upgrade: Status ${res.statusCode} (erwartet: 101)`);
       console.log(`   → Server antwortet, aber Upgrade nicht erfolgreich`);
-      console.log(`   → Möglicherweise wird nur HTTP-Polling unterstützt`);
-      process.exit(0);
+      
+      // Lese Response-Body für weitere Informationen
+      let body = '';
+      res.on('data', (chunk) => {
+        body += chunk;
+      });
+      res.on('end', () => {
+        if (body) {
+          console.log(`   Response Body: ${body.substring(0, 200)}`);
+        }
+        if (res.statusCode === 400) {
+          console.log(`   → Socket.IO lehnt den Request ab (Bad Request)`);
+          console.log(`   → Möglicherweise fehlt die Session-ID oder sie ist ungültig`);
+        }
+        process.exit(0);
+      });
     }
   });