diff --git a/lib/auth.dart b/lib/auth.dart
index 26f6eb9..787b494 100644
--- a/lib/auth.dart
+++ b/lib/auth.dart
@@ -9,6 +9,8 @@ class AuthInfo {
   ServerStatus? _status;
   ServerStatus? get status => _status;
   bool get isAuthed => (_user != null);
+  bool _checked = false;
+  bool get checked => _checked;
 
   Future<void> getServerStatus() async {
     _status = (await api.getStatus()).unwrap();
@@ -21,6 +23,7 @@ class AuthInfo {
     } else {
       _user = null;
     }
+    _checked = true;
     await getServerStatus();
     return re.ok;
   }
diff --git a/lib/globals.dart b/lib/globals.dart
index 831545d..61f8e99 100644
--- a/lib/globals.dart
+++ b/lib/globals.dart
@@ -5,6 +5,7 @@ import 'package:dio_cookie_manager/dio_cookie_manager.dart';
 import 'package:flutter/material.dart';
 import 'package:flutter/scheduler.dart';
 import 'package:go_router/go_router.dart';
+import 'package:path/path.dart' as path;
 import 'package:path_provider/path_provider.dart';
 import 'package:shared_preferences/shared_preferences.dart';
 import 'api/client.dart';
@@ -23,12 +24,24 @@ final dio = Dio()
 Config? _prefs;
 EHApi? _api;
 
-Future<void> prepareJar() async {
+Future<String> _getJarPath() async {
+  if (isWindows) {
+    try {
+      final p = await platformPath.getCurrentExe();
+      if (p != null) {
+        return path.join(path.dirname(p), "cookies");
+      }
+    } catch (e) {
+      // Do nothing
+    }
+  }
   final Directory appDocDir = await getApplicationDocumentsDirectory();
   final String appDocPath = appDocDir.path;
-  final jar = PersistCookieJar(
-    storage: FileStorage('$appDocPath/.eh-cookies/'),
-  );
+  return '$appDocPath/.eh-cookies/';
+}
+
+Future<void> prepareJar() async {
+  final jar = PersistCookieJar(storage: FileStorage(await _getJarPath()));
   dio.interceptors.add(CookieManager(jar));
 }
 
diff --git a/lib/login.dart b/lib/login.dart
index 9c2f48a..21fb997 100644
--- a/lib/login.dart
+++ b/lib/login.dart
@@ -1,8 +1,12 @@
 import 'package:flutter/material.dart';
+import 'package:flutter/scheduler.dart';
 import 'package:flutter_gen/gen_l10n/app_localizations.dart';
 import 'package:go_router/go_router.dart';
+import 'package:logging/logging.dart';
 import 'globals.dart';
 
+final _log = Logger("LoginPage");
+
 class LoginPage extends StatefulWidget {
   const LoginPage({Key? key}) : super(key: key);
 
@@ -19,6 +23,7 @@ class _LoginPageState extends State<LoginPage> {
   bool _passwordVisible = false;
   bool _isValid = false;
   bool _isLogin = false;
+  bool _checkAuth = false;
 
   @override
   void initState() {
@@ -68,9 +73,32 @@ class _LoginPageState extends State<LoginPage> {
     return re.ok;
   }
 
+  void _checkStatus(BuildContext build) {
+    if (auth.isAuthed) {
+      SchedulerBinding.instance.addPostFrameCallback((_) {
+        build.go("/");
+      });
+      return;
+    }
+    if (!auth.checked) {
+      if (_checkAuth) return;
+      _checkAuth = true;
+      auth.checkAuth().then((re) {
+        _checkAuth = false;
+        if (re) {
+          build.go("/");
+        }
+      }).catchError((e) {
+        _log.severe("Failed to check auth info:", e);
+        _checkAuth = false;
+      });
+    }
+  }
+
   @override
   Widget build(BuildContext context) {
     tryInitApi(context);
+    _checkStatus(context);
     return Scaffold(
       body: Container(
           padding: const EdgeInsets.symmetric(horizontal: 100),
@@ -124,6 +152,7 @@ class _LoginPageState extends State<LoginPage> {
                                     });
                                   }
                                 }).catchError((e) {
+                                  _log.severe("Failed to login:", e);
                                   setState(() {
                                     _isLogin = false;
                                   });
diff --git a/lib/main.dart b/lib/main.dart
index ae5135b..3654d8c 100644
--- a/lib/main.dart
+++ b/lib/main.dart
@@ -36,7 +36,9 @@ Future<void> initLogger() async {
     Logger.root.level = Level(logLevelName, logLevel);
   }
   Logger.root.onRecord.listen((record) {
-    print('${record.level.name}: ${record.time}: ${record.message}');
+    final stack = record.stackTrace != null ? '\n${record.stackTrace}' : '';
+    print(
+        '${record.level.name}: ${record.time}: ${record.message}${record.error}$stack');
   });
   return;
 }