diff --git a/backend/app/app.py b/backend/app/app.py
index e35b34f9..fb403f14 100644
--- a/backend/app/app.py
+++ b/backend/app/app.py
@@ -11,12 +11,11 @@ from sqlalchemy import func
 
 # Lokale Imports
 from models import init_database, create_initial_admin, User, Printer, Job, Stats, SystemLog, get_db_session, GuestRequest, UserPermission, Notification
-from utils.logging_config import setup_logging, get_logger
-from utils.decorators import measure_execution_time
+from utils.logging_config import setup_logging, get_logger, measure_execution_time, log_startup_info, debug_request, debug_response
 from utils.file_manager import FileManager
 from utils.job_scheduler import JobScheduler, get_job_scheduler
 from utils.queue_manager import start_queue_manager, stop_queue_manager, get_queue_manager
-from config.settings import SECRET_KEY, UPLOAD_FOLDER, ALLOWED_EXTENSIONS, ENVIRONMENT
+from config.settings import SECRET_KEY, UPLOAD_FOLDER, ALLOWED_EXTENSIONS, ENVIRONMENT, SESSION_LIFETIME
 
 # Blueprints importieren
 from blueprints.guest import guest_blueprint
diff --git a/backend/app/utils/queue_manager.py b/backend/app/utils/queue_manager.py
index 3226c69c..e6deba81 100644
--- a/backend/app/utils/queue_manager.py
+++ b/backend/app/utils/queue_manager.py
@@ -6,17 +6,62 @@ Queue Manager für die Verwaltung von Druckjobs in Warteschlangen.
 import threading
 import time
 import logging
+import subprocess
+import os
+import requests
 from datetime import datetime, timedelta
-from typing import List, Dict, Optional
+from typing import List, Dict, Optional, Tuple
 from contextlib import contextmanager
 
 from models import get_db_session, Job, Printer, User, Notification
 from utils.logging_config import get_logger
-from utils.printer_status import check_printer_status
 
 # Logger für Queue-Manager
 queue_logger = get_logger("queue_manager")
 
+def check_printer_status(ip_address: str, timeout: int = 5) -> Tuple[str, bool]:
+    """
+    Vereinfachte Drucker-Status-Prüfung für den Queue Manager.
+    
+    Args:
+        ip_address: IP-Adresse der Drucker-Steckdose
+        timeout: Timeout in Sekunden (Standard: 5)
+        
+    Returns:
+        Tuple[str, bool]: (Status, Aktiv) - Status ist "online" oder "offline", Aktiv ist True/False
+    """
+    if not ip_address or ip_address.strip() == "":
+        return "offline", False
+    
+    try:
+        # Ping-Test um Erreichbarkeit zu prüfen
+        if os.name == 'nt':  # Windows
+            cmd = ['ping', '-n', '1', '-w', str(timeout * 1000), ip_address.strip()]
+        else:  # Unix/Linux/macOS
+            cmd = ['ping', '-c', '1', '-W', str(timeout), ip_address.strip()]
+        
+        result = subprocess.run(
+            cmd,
+            capture_output=True,
+            text=True,
+            timeout=timeout + 1
+        )
+        
+        # Wenn Ping erfolgreich ist, als online betrachten
+        if result.returncode == 0:
+            queue_logger.debug(f"✅ Drucker {ip_address} ist erreichbar (Ping erfolgreich)")
+            return "online", True
+        else:
+            queue_logger.debug(f"❌ Drucker {ip_address} nicht erreichbar (Ping fehlgeschlagen)")
+            return "offline", False
+            
+    except subprocess.TimeoutExpired:
+        queue_logger.warning(f"⏱️ Ping-Timeout für Drucker {ip_address} nach {timeout} Sekunden")
+        return "offline", False
+    except Exception as e:
+        queue_logger.error(f"❌ Fehler beim Status-Check für Drucker {ip_address}: {str(e)}")
+        return "offline", False
+
 class PrinterQueueManager:
     """
     Verwaltet die Warteschlangen für offline Drucker und überwacht deren Status.