diff --git a/lib/pages/download_page/components/task_action_dialogs.dart b/lib/pages/download_page/components/task_action_dialogs.dart
index 2c5ffa1..add288e 100644
--- a/lib/pages/download_page/components/task_action_dialogs.dart
+++ b/lib/pages/download_page/components/task_action_dialogs.dart
@@ -363,7 +363,7 @@ class TaskActionDialogs {
         error: e,
         stackTrace: stackTrace,
       );
-      failCount += tasks.length;
+      failCount += tasks.length - successCount - skippedCount;
     } finally {
       client?.close();
     }
diff --git a/lib/pages/download_page/components/task_details_dialog.dart b/lib/pages/download_page/components/task_details_dialog.dart
index 9ba5939..0dbcada 100644
--- a/lib/pages/download_page/components/task_details_dialog.dart
+++ b/lib/pages/download_page/components/task_details_dialog.dart
@@ -206,6 +206,7 @@ class TaskDetailsDialog {
                       List<Map<String, dynamic>>? peersResult;
                       String? peersErrorLocal;
                       try {
+                        if (!outerContext.mounted) return;
                         final instanceManager = outerContext
                             .read<InstanceManager>();
                         final instance = instanceManager.getInstanceById(
diff --git a/lib/services/aria2_rpc_client.dart b/lib/services/aria2_rpc_client.dart
index dd9f4df..2784cf2 100644
--- a/lib/services/aria2_rpc_client.dart
+++ b/lib/services/aria2_rpc_client.dart
@@ -597,6 +597,11 @@ class Aria2RpcClient with Loggable {
       _webSocketSubscription = null;
       _webSocket?.close();
       _webSocket = null;
+      for (final completer in _pendingRequests.values) {
+        if (!completer.isCompleted) {
+          completer.completeError(ConnectionFailedException());
+        }
+      }
       _pendingRequests.clear();
     } else {
       _httpClient?.close();
diff --git a/lib/services/builtin_instance_service.dart b/lib/services/builtin_instance_service.dart
index 6ba290f..8e638c0 100644
--- a/lib/services/builtin_instance_service.dart
+++ b/lib/services/builtin_instance_service.dart
@@ -329,7 +329,7 @@ class BuiltinInstanceService with Loggable {
       '--bt-load-saved-metadata=${settings['btLoadSavedMetadata'] ?? true}',
       '--bt-seed-unverified=${settings['keepSeeding'] ?? false}',
       '--listen-port=$btListenPort',
-      '--dht-listen-port=${settings['dhtListenPort'] ?? 26701}',
+      '--dht-listen-port=${_resolveEffectiveDhtListenPort(settings)}',
       '--enable-dht6=${settings['enableDht6'] ?? true}',
       '--conf-path=$_aria2ConfPath',
       '--save-session=$sessionPath',