fix: use correct ping args on Windows (-n/-w instead of -c/-W)

backend/app/services/status_checker.py

@@ -2,6 +2,7 @@
 import asyncio
 import logging
 import socket
+import sys
 import time
 from typing import Any
 
@@ -57,8 +58,12 @@ async def check_node(check_method: str, target: str | None, ip: str | None) -> d
 
 
 async def _ping(host: str) -> bool:
+    if sys.platform == "win32":
+        args = ["ping", "-n", "1", "-w", "1000", host]
+    else:
+        args = ["ping", "-c", "1", "-W", "1", host]
     proc = await asyncio.create_subprocess_exec(
-        "ping", "-c", "1", "-W", "1", host,
+        *args,
         stdout=asyncio.subprocess.DEVNULL,
         stderr=asyncio.subprocess.DEVNULL,
     )

backend/tests/test_status_checker.py

@@ -3,7 +3,7 @@ from unittest.mock import AsyncMock, MagicMock, patch
 
 import pytest
 
-from app.services.status_checker import _tcp_connect, check_node
+from app.services.status_checker import _ping, _tcp_connect, check_node
 
 # --- check_node dispatcher ---
 
@@ -149,6 +149,48 @@ async def test_check_node_exception_returns_offline():
     assert result["response_time_ms"] is None
 
 
+# --- _ping platform args ---
+
+@pytest.mark.asyncio
+async def test_ping_uses_unix_args_on_non_windows():
+    captured = {}
+
+    async def fake_exec(*args, **kwargs):
+        captured["args"] = args
+        proc = MagicMock()
+        proc.returncode = 0
+        proc.wait = AsyncMock()
+        return proc
+
+    with patch("app.services.status_checker.sys.platform", "linux"), \
+         patch("asyncio.create_subprocess_exec", side_effect=fake_exec):
+        await _ping("192.168.1.1")
+
+    assert "-c" in captured["args"]
+    assert "-W" in captured["args"]
+    assert "-n" not in captured["args"]
+
+
+@pytest.mark.asyncio
+async def test_ping_uses_windows_args_on_win32():
+    captured = {}
+
+    async def fake_exec(*args, **kwargs):
+        captured["args"] = args
+        proc = MagicMock()
+        proc.returncode = 0
+        proc.wait = AsyncMock()
+        return proc
+
+    with patch("app.services.status_checker.sys.platform", "win32"), \
+         patch("asyncio.create_subprocess_exec", side_effect=fake_exec):
+        await _ping("192.168.1.1")
+
+    assert "-n" in captured["args"]
+    assert "-w" in captured["args"]
+    assert "-c" not in captured["args"]
+
+
 # --- _tcp_connect ---
 
 @pytest.mark.asyncio