diff --git a/src/YhCore.WebApi/Middleware/SsoProtectionMiddleware.cs b/src/YhCore.WebApi/Middleware/SsoProtectionMiddleware.cs
index dc4878d..7d8f071 100644
--- a/src/YhCore.WebApi/Middleware/SsoProtectionMiddleware.cs
+++ b/src/YhCore.WebApi/Middleware/SsoProtectionMiddleware.cs
@@ -96,7 +96,7 @@ namespace YhCore.WebApi.Middleware
                 {
                     context.Response.StatusCode = StatusCodes.Status200OK;
                     context.Response.ContentType = "application/json; charset=utf-8";
-                    throw new DException("未登录!");
+                    throw new DException(ErrorCode.Unauthorized);
                 }
 
                 // 未认证 → Challenge → 302 重定向 CAS 登录页（ticket 校验与回跳由新框架 CasAuthenticationHandler 处理）