diff --git a/src/i18n/locales/en.json b/src/i18n/locales/en.json
index 95d5449..7f48feb 100644
--- a/src/i18n/locales/en.json
+++ b/src/i18n/locales/en.json
@@ -85,14 +85,15 @@
     "submit_button": "Login",
     "submitting": "Connecting...",
     "error_title": "Login Failed",
+    "error_backend_detail": "Backend response",
     "error_required": "Please fill in complete connection information",
-    "error_invalid": "Connection failed, please check address and key",
+    "error_invalid": "Connection failed, please check the server address, Management API, and management key",
     "error_network": "Network connection failed, please check your network or server address",
     "error_timeout": "Connection timed out, server not responding",
-    "error_unauthorized": "Authentication failed, invalid management key",
-    "error_forbidden": "Access denied, insufficient permissions",
-    "error_not_found": "Server address invalid or management API not enabled",
-    "error_server": "Internal server error, please try again later",
+    "error_unauthorized": "Authentication failed, management key is missing or invalid",
+    "error_forbidden": "Access denied, remote management is disabled, the management key is not configured, or this IP is temporarily banned",
+    "error_not_found": "Management API not found, confirm the server address points to the CLIProxyAPI backend",
+    "error_server": "Backend failed while handling the management request, check the server logs",
     "error_cors": "Cross-origin request blocked, please check server configuration",
     "error_ssl": "SSL/TLS certificate verification failed"
   },
diff --git a/src/i18n/locales/ru.json b/src/i18n/locales/ru.json
index 6cf6082..66a18fa 100644
--- a/src/i18n/locales/ru.json
+++ b/src/i18n/locales/ru.json
@@ -85,14 +85,15 @@
     "submit_button": "Войти",
     "submitting": "Подключение...",
     "error_title": "Ошибка входа",
+    "error_backend_detail": "Ответ сервера",
     "error_required": "Пожалуйста, заполните все данные подключения",
-    "error_invalid": "Подключение не удалось, проверьте адрес и ключ",
+    "error_invalid": "Подключение не удалось, проверьте адрес сервера, Management API и ключ управления",
     "error_network": "Сетевая ошибка, проверьте подключение или адрес сервера",
     "error_timeout": "Время ожидания истекло, сервер не отвечает",
-    "error_unauthorized": "Аутентификация не удалась, неверный ключ управления",
-    "error_forbidden": "Доступ запрещён, недостаточно прав",
-    "error_not_found": "Неверный адрес сервера или интерфейс управления не включён",
-    "error_server": "Внутренняя ошибка сервера, попробуйте позже",
+    "error_unauthorized": "Аутентификация не удалась, ключ управления отсутствует или неверен",
+    "error_forbidden": "Доступ запрещён: удалённое управление отключено, ключ управления не настроен или IP временно заблокирован",
+    "error_not_found": "Management API не найден, проверьте, что адрес указывает на backend CLIProxyAPI",
+    "error_server": "Backend не смог обработать запрос управления, проверьте журналы сервера",
     "error_cors": "Блокировка CORS, проверьте конфигурацию сервера",
     "error_ssl": "Ошибка проверки SSL/TLS сертификата"
   },
diff --git a/src/i18n/locales/zh-CN.json b/src/i18n/locales/zh-CN.json
index d7c8204..6a0d1ce 100644
--- a/src/i18n/locales/zh-CN.json
+++ b/src/i18n/locales/zh-CN.json
@@ -85,14 +85,15 @@
     "submit_button": "登录",
     "submitting": "连接中...",
     "error_title": "登录失败",
+    "error_backend_detail": "后端返回",
     "error_required": "请填写完整的连接信息",
-    "error_invalid": "连接失败，请检查地址和密钥",
+    "error_invalid": "连接失败，请检查服务地址、管理接口和管理密钥",
     "error_network": "网络连接失败，请检查网络或服务器地址",
     "error_timeout": "连接超时，服务器无响应",
-    "error_unauthorized": "认证失败，管理密钥无效",
-    "error_forbidden": "访问被拒绝，权限不足",
-    "error_not_found": "服务器地址无效或管理接口未启用",
-    "error_server": "服务器内部错误，请稍后重试",
+    "error_unauthorized": "认证失败，管理密钥缺失或无效",
+    "error_forbidden": "访问被拒绝，远程管理未启用、管理密钥未配置或 IP 被临时封禁",
+    "error_not_found": "未找到 Management API，请确认服务地址指向 CLIProxyAPI 后端",
+    "error_server": "后端处理管理接口时发生错误，请查看服务日志",
     "error_cors": "跨域请求被阻止，请检查服务器配置",
     "error_ssl": "SSL/TLS 证书验证失败"
   },
diff --git a/src/i18n/locales/zh-TW.json b/src/i18n/locales/zh-TW.json
index ffdc69a..15ea873 100644
--- a/src/i18n/locales/zh-TW.json
+++ b/src/i18n/locales/zh-TW.json
@@ -85,14 +85,15 @@
     "submit_button": "登入",
     "submitting": "連線中...",
     "error_title": "登入失敗",
+    "error_backend_detail": "後端返回",
     "error_required": "請填寫完整的連線資訊",
-    "error_invalid": "連線失敗，請檢查位址和金鑰",
+    "error_invalid": "連線失敗，請檢查服務位址、管理介面和管理金鑰",
     "error_network": "網路連線失敗，請檢查網路或伺服器位址",
     "error_timeout": "連線逾時，伺服器無回應",
-    "error_unauthorized": "驗證失敗，管理金鑰無效",
-    "error_forbidden": "存取被拒絕，權限不足",
-    "error_not_found": "伺服器位址無效或管理介面未啟用",
-    "error_server": "伺服器內部錯誤，請稍後再試",
+    "error_unauthorized": "驗證失敗，管理金鑰缺失或無效",
+    "error_forbidden": "存取被拒絕，遠端管理未啟用、管理金鑰未設定或 IP 被暫時封鎖",
+    "error_not_found": "找不到 Management API，請確認服務位址指向 CLIProxyAPI 後端",
+    "error_server": "後端處理管理介面時發生錯誤，請查看服務日誌",
     "error_cors": "跨域請求被阻擋，請檢查伺服器設定",
     "error_ssl": "SSL/TLS 憑證驗證失敗"
   },
diff --git a/src/pages/LoginPage.tsx b/src/pages/LoginPage.tsx
index 6a15197..bf610a1 100644
--- a/src/pages/LoginPage.tsx
+++ b/src/pages/LoginPage.tsx
@@ -32,18 +32,33 @@ function getLocalizedErrorMessage(error: unknown, t: (key: string) => string): s
           ? error
           : '';
 
+  const withHttpStatus = (summary: string) => {
+    if (!status) {
+      return summary;
+    }
+
+    const genericAxiosMessage = `Request failed with status code ${status}`;
+    const detail = message.trim();
+    const backendDetail =
+      detail && detail !== genericAxiosMessage
+        ? ` (${t('login.error_backend_detail')}: ${detail})`
+        : '';
+
+    return `HTTP ${status}: ${summary}${backendDetail}`;
+  };
+
   // 根据 HTTP 状态码判断
   if (status === 401) {
-    return t('login.error_unauthorized');
+    return withHttpStatus(t('login.error_unauthorized'));
   }
   if (status === 403) {
-    return t('login.error_forbidden');
+    return withHttpStatus(t('login.error_forbidden'));
   }
   if (status === 404) {
-    return t('login.error_not_found');
+    return withHttpStatus(t('login.error_not_found'));
   }
   if (status && status >= 500) {
-    return t('login.error_server');
+    return withHttpStatus(t('login.error_server'));
   }
 
   // 根据 axios 错误码判断
@@ -63,7 +78,7 @@ function getLocalizedErrorMessage(error: unknown, t: (key: string) => string): s
   }
 
   // 默认错误消息
-  return t('login.error_invalid');
+  return withHttpStatus(t('login.error_invalid'));
 }
 
 export function LoginPage() {