diff --git a/grimmory.py b/grimmory.py
index d9fca48..4d5cefe 100644
--- a/grimmory.py
+++ b/grimmory.py
@@ -21,7 +21,7 @@ def _is_in_grimmory(filename: str, url: str, user: str, password: str) -> bool:
     stem = Path(filename).stem
     try:
         r = requests.get(
-            url.rstrip("/") + "/api/v1/books",
+            url.rstrip("/") + "/komga/api/v1/books",
             params={"search": stem},
             auth=(user, password),
             timeout=10,
@@ -72,18 +72,20 @@ def place_book(
 
 
 def test_connection(url: str, user: str, password: str) -> tuple[bool, str]:
+    base = url.rstrip("/")
     try:
-        r = requests.get(
-            url.rstrip("/") + "/api/v1/books",
-            params={"size": 1},
-            auth=(user, password),
-            timeout=10,
-        )
-        if r.status_code == 200:
+        # Health check (no auth required)
+        r = requests.get(base + "/api/v1/healthcheck", timeout=10)
+        if r.status_code != 200:
+            return False, f"Grimmory not reachable (HTTP {r.status_code})"
+        # Verify credentials against Komga-compatible API
+        r2 = requests.get(base + "/komga/api/v1/books", params={"size": 1},
+                          auth=(user, password), timeout=10)
+        if r2.status_code == 200:
             return True, "Connected to Grimmory successfully"
-        if r.status_code == 401:
-            return False, "Authentication failed — check username and password"
-        return False, f"HTTP {r.status_code}"
+        if r2.status_code == 401:
+            return False, "Grimmory reachable but credentials rejected — check username and password"
+        return True, f"Grimmory reachable (API returned HTTP {r2.status_code})"
     except requests.exceptions.ConnectionError:
         return False, "Could not connect — check the URL"
     except Exception as e: