diff --git a/app/main.py b/app/main.py
index 13e8a59..e842e90 100644
--- a/app/main.py
+++ b/app/main.py
@@ -25,6 +25,14 @@ def hex2b(s: str) -> bytes:
     parts = [p for p in s.split() if p]
     return bytes(int(p, 16) for p in parts)
 
+def serial_port_connected(port: str):
+    try:
+        from serial.tools import list_ports
+        ports = {p.device for p in list_ports.comports()}
+        return port in ports, None
+    except Exception as e:
+        return None, str(e)
+
 
 APP_MODE = env("APP_MODE", "serial").strip().lower()
 if APP_MODE not in ("serial", "mock"):
@@ -50,14 +58,25 @@ class CustomReq(BaseModel):
 
 @app.get("/health")
 def health():
+    port_connected = None
+    port_error = None
+    port_status = None
+    if cfg and cfg.port:
+        port_connected, port_error = serial_port_connected(cfg.port)
+        if port_connected is False:
+            port_status = "Port COM pas connecte"
+    if cfg is None or not cfg.port:
+        port_status = "Port COM pas configure"
     return {
-        "ok": True,
+        "ok": False if port_connected is False or (cfg is None or not cfg.port) else True,
         "mode": APP_MODE,
         "busy": bridge.busy(),
         "hostname": socket.gethostname(),
         "timestamp": time.time(),
-        "port": cfg.port if cfg else None,
+        "port": port_status if port_status else (cfg.port if cfg else None),
         "baudrate": cfg.baudrate if cfg else None,
+        "port_connected": port_connected,
+        "port_error": port_error,
     }