diff --git a/debug-production.js b/debug-production.js
new file mode 100644
index 0000000..ca4dd3d
--- /dev/null
+++ b/debug-production.js
@@ -0,0 +1,59 @@
+#!/usr/bin/env node
+
+// Script de diagnostic pour la production LogiFlow
+// Usage: node debug-production.js [URL_BASE]
+
+const url = process.argv[2] || 'https://logiflow.ffnancy.fr';
+
+const runDiagnostics = async () => {
+  console.log(`🔍 Diagnostic de production pour ${url}\n`);
+  
+  const endpoints = [
+    { path: '/api/health', desc: 'Health Check' },
+    { path: '/api/user', desc: 'API User (attendu: 401)' },
+    { path: '/api/default-credentials-check', desc: 'Credentials Check' },
+    { path: '/', desc: 'Page principale' },
+    { path: '/sav', desc: 'Page SAV' }
+  ];
+
+  for (const endpoint of endpoints) {
+    try {
+      console.log(`📡 Test ${endpoint.desc}: ${url}${endpoint.path}`);
+      
+      const response = await fetch(`${url}${endpoint.path}`, {
+        method: 'GET',
+        headers: {
+          'User-Agent': 'LogiFlow-Debug/1.0'
+        }
+      });
+      
+      console.log(`   Status: ${response.status} ${response.statusText}`);
+      
+      if (endpoint.path === '/api/health' && response.ok) {
+        const data = await response.json();
+        console.log(`   Détails:`, data);
+      }
+      
+      if (response.status === 502) {
+        console.log(`   ❌ Erreur 502: Service indisponible ou problème de proxy`);
+      } else if (response.ok || response.status === 401) {
+        console.log(`   ✅ Service répond correctement`);
+      } else {
+        console.log(`   ⚠️  Status inattendu`);
+      }
+      
+    } catch (error) {
+      console.log(`   ❌ Erreur de connexion: ${error.message}`);
+    }
+    
+    console.log('');
+  }
+  
+  console.log('🔧 Actions recommandées:');
+  console.log('1. Vérifier les logs Docker: docker-compose logs logiflow');
+  console.log('2. Vérifier le status: docker-compose ps');
+  console.log('3. Redémarrer si nécessaire: docker-compose restart logiflow');
+  console.log('4. Forcer rebuild: docker-compose up --build -d');
+};
+
+runDiagnostics().catch(console.error);
\ No newline at end of file
diff --git a/production-health-check.sh b/production-health-check.sh
new file mode 100755
index 0000000..502f965
--- /dev/null
+++ b/production-health-check.sh
@@ -0,0 +1,45 @@
+#!/bin/bash
+
+# Script de vérification de santé pour LogiFlow en production
+echo "🔍 Vérification de santé LogiFlow Production"
+echo "=============================================="
+
+# Vérifier le status des containers
+echo "📊 Status des containers:"
+docker-compose ps
+
+echo ""
+echo "🏥 Health checks:"
+docker-compose exec logiflow wget --spider -q http://localhost:3000/api/health
+if [ $? -eq 0 ]; then
+    echo "✅ Health check API OK"
+else
+    echo "❌ Health check API FAILED"
+fi
+
+# Vérifier les fichiers statiques
+echo ""
+echo "📁 Vérification des fichiers statiques:"
+docker-compose exec logiflow ls -la /app/dist/public/ | head -10
+
+# Test des endpoints critiques
+echo ""
+echo "🌐 Test des endpoints:"
+echo "Health:"
+curl -s -o /dev/null -w "Status: %{http_code}\n" https://logiflow.ffnancy.fr/api/health
+
+echo "Root:"
+curl -s -o /dev/null -w "Status: %{http_code}\n" https://logiflow.ffnancy.fr/
+
+echo "SAV:"
+curl -s -o /dev/null -w "Status: %{http_code}\n" https://logiflow.ffnancy.fr/sav
+
+# Dernières logs
+echo ""
+echo "📋 Dernières logs (10 lignes):"
+docker-compose logs --tail=10 logiflow
+
+echo ""
+echo "🔧 Si erreur 502 persistent:"
+echo "   docker-compose restart logiflow"
+echo "   docker-compose up --build -d  # Rebuild complet"
\ No newline at end of file
diff --git a/server/index.production.ts b/server/index.production.ts
index 6b70bae..27f0d28 100644
--- a/server/index.production.ts
+++ b/server/index.production.ts
@@ -45,7 +45,9 @@ async function registerProductionRoutes(app: Express): Promise<Server> {
       status: 'healthy',
       timestamp: new Date().toISOString(),
       environment: 'production',
-      database: 'connected'
+      database: 'connected',
+      port: process.env.PORT || 3000,
+      publicPath: join(__dirname, 'public')
     });
   });
   
@@ -180,12 +182,29 @@ console.log('🐳 Serving static files from:', publicPath);
 app.use('/assets', express.static(join(publicPath, 'assets')));
 app.use('/', express.static(publicPath));
 
+// Add explicit root route handler
+app.get('/', (req, res) => {
+  console.log('🏠 ROOT: Serving index.html for root request');
+  res.sendFile(join(publicPath, 'index.html'), (err) => {
+    if (err) {
+      console.error('❌ ROOT: Error serving index.html:', err);
+      res.status(500).send('Error loading application');
+    }
+  });
+});
+
 // SPA fallback - serve index.html for all non-API routes
 app.get('*', (req, res, next) => {
   if (req.path.startsWith('/api/')) {
     return next();
   }
-  res.sendFile(join(publicPath, 'index.html'));
+  console.log(`📄 SPA: Serving index.html for ${req.path}`);
+  res.sendFile(join(publicPath, 'index.html'), (err) => {
+    if (err) {
+      console.error(`❌ SPA: Error serving index.html for ${req.path}:`, err);
+      res.status(500).send('Error loading application');
+    }
+  });
 });
 
 const port = process.env.PORT ? parseInt(process.env.PORT) : 3000;