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diff --git a/debug_production.js b/debug_production.js
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+++ b/debug_production.js
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+#!/usr/bin/env node
+
+// Script de débogage pour tester les endpoints de production
+import https from 'https';
+
+const BASE_URL = 'https://logiflow.ffnancy.fr';
+
+async function makeRequest(path, options = {}) {
+  return new Promise((resolve, reject) => {
+    const url = new URL(path, BASE_URL);
+    const requestOptions = {
+      hostname: url.hostname,
+      path: url.pathname + url.search,
+      method: options.method || 'GET',
+      headers: {
+        'Content-Type': 'application/json',
+        'User-Agent': 'Debug-Script/1.0',
+        ...options.headers
+      }
+    };
+
+    const req = https.request(requestOptions, (res) => {
+      let data = '';
+      res.on('data', (chunk) => data += chunk);
+      res.on('end', () => {
+        resolve({
+          status: res.statusCode,
+          headers: res.headers,
+          data: data,
+          length: data.length
+        });
+      });
+    });
+
+    req.on('error', (error) => {
+      reject(error);
+    });
+
+    if (options.body) {
+      req.write(options.body);
+    }
+    
+    req.end();
+  });
+}
+
+async function debugProduction() {
+  console.log('🔍 Testing production endpoints...\n');
+  
+  try {
+    // Test 1: Health check
+    console.log('1. Health check:');
+    const health = await makeRequest('/api/health');
+    console.log(`   Status: ${health.status}`);
+    console.log(`   Response: ${health.data.substring(0, 100)}...\n`);
+
+    // Test 2: Default credentials check
+    console.log('2. Default credentials check:');
+    const defaultCreds = await makeRequest('/api/default-credentials-check');
+    console.log(`   Status: ${defaultCreds.status}`);
+    console.log(`   Response: ${defaultCreds.data}\n`);
+
+    // Test 3: Login attempts with different credentials
+    const credentialsList = [
+      { username: 'admin', password: 'admin' },
+      { username: 'administrator', password: 'administrator' },
+      { username: 'lff', password: 'lff2024' },
+      { username: 'logiflow', password: 'logiflow' },
+      { username: 'root', password: 'root' }
+    ];
+    
+    let login = null;
+    let cookies = '';
+    
+    for (const creds of credentialsList) {
+      console.log(`3. Login attempt with ${creds.username}:${creds.password}:`);
+      login = await makeRequest('/api/login', {
+        method: 'POST',
+        body: JSON.stringify(creds)
+      });
+      console.log(`   Status: ${login.status}`);
+      console.log(`   Response: ${login.data.substring(0, 200)}...\n`);
+      
+      if (login.status === 200 && login.headers['set-cookie']) {
+        cookies = login.headers['set-cookie'].map(c => c.split(';')[0]).join('; ');
+        console.log(`✅ Successful login with ${creds.username}\n`);
+        break;
+      }
+    }
+    
+    // Cookies already extracted above if login was successful
+
+    // Test 4: User info (with cookies)
+    if (cookies) {
+      console.log('4. User info (authenticated):');
+      const user = await makeRequest('/api/user', {
+        headers: { 'Cookie': cookies }
+      });
+      console.log(`   Status: ${user.status}`);
+      console.log(`   Response: ${user.data.substring(0, 200)}...\n`);
+
+      // Test 5: Tasks (with cookies)
+      console.log('5. Tasks list (authenticated):');
+      const tasks = await makeRequest('/api/tasks', {
+        headers: { 'Cookie': cookies }
+      });
+      console.log(`   Status: ${tasks.status}`);
+      console.log(`   Response: ${tasks.data.substring(0, 300)}...\n`);
+
+      // Test 6: Test task update (with cookies) - testing the problematic endpoint
+      console.log('6. Task update test (problematic endpoint):');
+      const taskUpdate = await makeRequest('/api/tasks/99', {
+        method: 'PUT',
+        headers: { 'Cookie': cookies },
+        body: JSON.stringify({
+          title: 'Test Debug',
+          description: 'Test de debug',
+          priority: 'medium',
+          status: 'pending',
+          assignedTo: 'admin',
+          startDate: '2025-08-20',
+          dueDate: null
+        })
+      });
+      console.log(`   Status: ${taskUpdate.status}`);
+      console.log(`   Response: ${taskUpdate.data}\n`);
+    } else {
+      console.log('❌ No cookies received from login - cannot test authenticated endpoints\n');
+    }
+
+  } catch (error) {
+    console.error('❌ Error during debug:', error.message);
+  }
+}
+
+debugProduction();
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diff --git a/test_task_update.html b/test_task_update.html
new file mode 100644
index 0000000..960cb89
--- /dev/null
+++ b/test_task_update.html
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+<!DOCTYPE html>
+<html>
+<head>
+    <title>Test Task Update - Production Debug</title>
+    <style>
+        body { font-family: monospace; padding: 20px; }
+        .log { margin: 10px 0; padding: 10px; background: #f5f5f5; }
+        .error { background: #ffe6e6; }
+        .success { background: #e6ffe6; }
+        button { padding: 10px; margin: 5px; }
+        textarea, input { width: 100%; margin: 5px 0; }
+    </style>
+</head>
+<body>
+    <h1>Test Task Update - Production Debug</h1>
+    
+    <div>
+        <h3>1. D'abord, connectez-vous manuellement sur LogiFlow</h3>
+        <p>Ouvrez <a href="https://logiflow.ffnancy.fr" target="_blank">LogiFlow</a> dans un autre onglet et connectez-vous avec vos vrais identifiants.</p>
+    </div>
+
+    <div>
+        <h3>2. Test de l'endpoint problématique</h3>
+        <label>Task ID à tester:</label>
+        <input type="number" id="taskId" value="99" />
+        
+        <label>JSON des données à envoyer:</label>
+        <textarea id="taskData" rows="10">{
+  "title": "Test Debug",
+  "description": "Test de debug depuis le script",
+  "priority": "medium",
+  "status": "pending",
+  "assignedTo": "admin",
+  "startDate": "2025-08-20",
+  "dueDate": null
+}</textarea>
+
+        <button onclick="testTaskUpdate()">Test Task Update (PUT)</button>
+        <button onclick="clearLogs()">Clear Logs</button>
+    </div>
+
+    <div id="logs"></div>
+
+    <script>
+        function log(message, type = 'info') {
+            const logs = document.getElementById('logs');
+            const div = document.createElement('div');
+            div.className = `log ${type}`;
+            div.innerHTML = `[${new Date().toLocaleTimeString()}] ${message}`;
+            logs.insertBefore(div, logs.firstChild);
+        }
+
+        function clearLogs() {
+            document.getElementById('logs').innerHTML = '';
+        }
+
+        async function testTaskUpdate() {
+            const taskId = document.getElementById('taskId').value;
+            const taskData = document.getElementById('taskData').value;
+            
+            log(`Testing task update for ID: ${taskId}`);
+            
+            try {
+                // Parse JSON data
+                const data = JSON.parse(taskData);
+                log(`Parsed data: ${JSON.stringify(data, null, 2)}`);
+                
+                // Test the problematic endpoint
+                const response = await fetch(`/api/tasks/${taskId}`, {
+                    method: 'PUT',
+                    headers: {
+                        'Content-Type': 'application/json'
+                    },
+                    credentials: 'same-origin', // Important pour envoyer les cookies de session
+                    body: taskData
+                });
+                
+                log(`Response status: ${response.status} ${response.statusText}`);
+                
+                if (response.ok) {
+                    const result = await response.json();
+                    log(`Success! Response: ${JSON.stringify(result, null, 2)}`, 'success');
+                } else {
+                    const error = await response.text();
+                    log(`Error response: ${error}`, 'error');
+                    
+                    // Additional debug info
+                    log(`Response headers: ${JSON.stringify([...response.headers.entries()])}`, 'error');
+                }
+                
+            } catch (error) {
+                log(`JavaScript error: ${error.message}`, 'error');
+                log(`Stack trace: ${error.stack}`, 'error');
+            }
+        }
+
+        // Test connectivity on load
+        window.onload = function() {
+            log('Script loaded. Please login to LogiFlow first!');
+            
+            // Test if we can reach the API
+            fetch('/api/user')
+                .then(response => {
+                    if (response.status === 401) {
+                        log('Not authenticated - please login first', 'error');
+                    } else if (response.ok) {
+                        log('Authenticated successfully', 'success');
+                        return response.json();
+                    } else {
+                        log(`Unexpected status: ${response.status}`, 'error');
+                    }
+                })
+                .then(user => {
+                    if (user) {
+                        log(`Logged in as: ${user.username} (${user.role})`, 'success');
+                    }
+                })
+                .catch(error => {
+                    log(`Connection test failed: ${error.message}`, 'error');
+                });
+        };
+    </script>
+</body>
+</html>
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