diff --git a/backend/app/services/sync.py b/backend/app/services/sync.py
index c3bb70f..f0ac679 100644
--- a/backend/app/services/sync.py
+++ b/backend/app/services/sync.py
@@ -22,13 +22,33 @@ async def fetch_radarr_movies() -> List[Dict]:
     
     async with httpx.AsyncClient() as client:
         try:
+            # First test connection with system status
+            status_response = await client.get(
+                f"{settings.radarr_url}/api/v3/system/status",
+                headers={"X-Api-Key": settings.radarr_api_key},
+                timeout=10.0
+            )
+            if status_response.status_code == 401:
+                logger.error("Radarr: Invalid API key")
+                return []
+            status_response.raise_for_status()
+            
+            # Fetch movies
             response = await client.get(
                 f"{settings.radarr_url}/api/v3/movie",
                 headers={"X-Api-Key": settings.radarr_api_key},
                 timeout=30.0
             )
             response.raise_for_status()
-            return response.json()
+            movies = response.json()
+            logger.info(f"Radarr: Fetched {len(movies)} movies")
+            return movies
+        except httpx.HTTPStatusError as e:
+            logger.error(f"Radarr HTTP error: {e.response.status_code} - {e.response.text[:200]}")
+            return []
+        except httpx.ConnectError as e:
+            logger.error(f"Radarr connection error: {e}. Check if Radarr is running on {settings.radarr_url}")
+            return []
         except Exception as e:
             logger.error(f"Failed to fetch Radarr movies: {e}")
             return []
@@ -48,7 +68,15 @@ async def fetch_sonarr_series() -> List[Dict]:
                 timeout=30.0
             )
             response.raise_for_status()
-            return response.json()
+            series = response.json()
+            logger.info(f"Sonarr: Fetched {len(series)} series")
+            return series
+        except httpx.HTTPStatusError as e:
+            logger.error(f"Sonarr HTTP error: {e.response.status_code} - {e.response.text[:200]}")
+            return []
+        except httpx.ConnectError as e:
+            logger.error(f"Sonarr connection error: {e}. Check if Sonarr is running on {settings.sonarr_url}")
+            return []
         except Exception as e:
             logger.error(f"Failed to fetch Sonarr series: {e}")
             return []
@@ -68,7 +96,15 @@ async def fetch_lidarr_artists() -> List[Dict]:
                 timeout=30.0
             )
             response.raise_for_status()
-            return response.json()
+            artists = response.json()
+            logger.info(f"Lidarr: Fetched {len(artists)} artists")
+            return artists
+        except httpx.HTTPStatusError as e:
+            logger.error(f"Lidarr HTTP error: {e.response.status_code} - {e.response.text[:200]}")
+            return []
+        except httpx.ConnectError as e:
+            logger.error(f"Lidarr connection error: {e}. Check if Lidarr is running on {settings.lidarr_url}")
+            return []
         except Exception as e:
             logger.error(f"Failed to fetch Lidarr artists: {e}")
             return []
@@ -269,9 +305,14 @@ async def upsert_media_item(source_kind: str, source_item_id: int, title: str,
 
 async def sync_radarr():
     """Sync movies from Radarr"""
+    logger.info(f"Starting Radarr sync from {settings.radarr_url}")
     movies = await fetch_radarr_movies()
-    synced = 0
     
+    if not movies:
+        logger.warning("Radarr: No movies fetched. Check API key and connection.")
+        return {"radarr": 0}
+    
+    synced = 0
     for movie in movies:
         try:
             # Try to get country from TMDB if tmdbId is available and no country in Radarr data
@@ -369,6 +410,9 @@ async def sync_lidarr():
 async def sync_all_arrs() -> Dict:
     """Sync from all *arr instances"""
     logger.info("Starting sync from all *arr instances")
+    logger.info(f"Radarr URL: {settings.radarr_url}, API key configured: {bool(settings.radarr_api_key)}")
+    logger.info(f"Sonarr URL: {settings.sonarr_url}, API key configured: {bool(settings.sonarr_api_key)}")
+    logger.info(f"Lidarr URL: {settings.lidarr_url}, API key configured: {bool(settings.lidarr_api_key)}")
     
     results = {}
     
@@ -376,7 +420,7 @@ async def sync_all_arrs() -> Dict:
     try:
         results.update(await sync_radarr())
     except Exception as e:
-        logger.error(f"Radarr sync failed: {e}")
+        logger.error(f"Radarr sync failed: {e}", exc_info=True)
         results["radarr"] = 0
     
     try: