diff --git a/UI/Controllers/UpgradeController.cs b/UI/Controllers/UpgradeController.cs
index a1309ea..2fe41ee 100644
--- a/UI/Controllers/UpgradeController.cs
+++ b/UI/Controllers/UpgradeController.cs
@@ -458,39 +458,36 @@ namespace UI.Controllers
         [HttpPost]
         public ActionResult GetRoomAddressStatus(int Code, string RoomNum)
         {
-            RoomAddressStatus roomAddressStatus = new RoomAddressStatus
-            {
-                Code = Code,
-                RoomNum = RoomNum
-            };
             try
             {
-                if (roomAddressStatus == null)
+                if (string.IsNullOrWhiteSpace(RoomNum))
                 {
+                    Response.TrySkipIisCustomErrors = true;
                     Response.StatusCode = (int)HttpStatusCode.BadRequest;
-                    return Json(new { Status = 0, Message = "请求参数不能为空" }, JsonRequestBehavior.DenyGet);
+                    return Json(new { Status = 0, Message = "请求参数不能为空" }, JsonRequestBehavior.AllowGet);
                 }
 
-                string code = roomAddressStatus.Code.ToString();
-                string RoomNumVal = roomAddressStatus.RoomNum ?? string.Empty;
+                string code = Code.ToString();
+                string RoomNumVal = RoomNum;
                 string key = $"WXFault_{code}_{RoomNumVal}";
                 var result = CSRedisCacheHelper.HMGetAll(key);
 
                 if (result != null && result.Count > 0)
                 {
-                    return Json(new { Status = 1, Message = "获取成功", Data = result }, JsonRequestBehavior.DenyGet);
+                    return Json(new { Status = 1, Message = "获取成功", Data = result }, JsonRequestBehavior.AllowGet);
                 }
                 else
                 {
-                    Response.StatusCode = (int)HttpStatusCode.NotFound;
-                    return Json(new { Status = 0, Message = "未找到数据", Data = result }, JsonRequestBehavior.DenyGet);
+                    // 业务层未找到数据：不返回 HTTP 404，避免 IIS 自定义 404 页覆盖 JSON
+                    return Json(new { Status = 1, Message = "未找到数据", Data = result }, JsonRequestBehavior.AllowGet);
                 }
             }
             catch (Exception ex)
             {
                 logger.Error(ex, "GetRoomAddressStatus error");
+                Response.TrySkipIisCustomErrors = true;
                 Response.StatusCode = (int)HttpStatusCode.InternalServerError;
-                return Json(new { Status = -1, Message = "服务器错误", Detail = ex.Message }, JsonRequestBehavior.DenyGet);
+                return Json(new { Status = -1, Message = "服务器错误", Detail = ex.Message }, JsonRequestBehavior.AllowGet);
             }
         }