diff --git a/shadowsocks-csharp/Localization/Strings.Designer.cs b/shadowsocks-csharp/Localization/Strings.Designer.cs
index 4534a9cf..6aa6738a 100644
--- a/shadowsocks-csharp/Localization/Strings.Designer.cs
+++ b/shadowsocks-csharp/Localization/Strings.Designer.cs
@@ -340,7 +340,7 @@ namespace Shadowsocks.Localization {
         }
         
         /// <summary>
-        ///   Looks up a localized string similar to Timeout.
+        ///   Looks up a localized string similar to Timeout (sec).
         /// </summary>
         internal static string Timeout {
             get {
diff --git a/shadowsocks-csharp/Localization/Strings.fr.resx b/shadowsocks-csharp/Localization/Strings.fr.resx
index be01a273..da708dd2 100644
--- a/shadowsocks-csharp/Localization/Strings.fr.resx
+++ b/shadowsocks-csharp/Localization/Strings.fr.resx
@@ -130,7 +130,7 @@
     <value>adresse</value>
   </data>
   <data name="Timeout" xml:space="preserve">
-    <value>Délai d'attente</value>
+    <value>Délai d'attente (sec)</value>
   </data>
   <data name="cancelButton_Content" xml:space="preserve">
     <value>Annuler</value>
diff --git a/shadowsocks-csharp/Localization/Strings.ja.resx b/shadowsocks-csharp/Localization/Strings.ja.resx
index 4d8f997d..b47f5ba1 100644
--- a/shadowsocks-csharp/Localization/Strings.ja.resx
+++ b/shadowsocks-csharp/Localization/Strings.ja.resx
@@ -130,7 +130,7 @@
     <value>ポート</value>
   </data>
   <data name="Timeout" xml:space="preserve">
-    <value>タイムアウト</value>
+    <value>タイムアウト (秒)</value>
   </data>
   <data name="cancelButton_Content" xml:space="preserve">
     <value>キャンセル</value>
diff --git a/shadowsocks-csharp/Localization/Strings.ko.resx b/shadowsocks-csharp/Localization/Strings.ko.resx
index 16df3925..65c899e4 100644
--- a/shadowsocks-csharp/Localization/Strings.ko.resx
+++ b/shadowsocks-csharp/Localization/Strings.ko.resx
@@ -130,7 +130,7 @@
     <value>포트</value>
   </data>
   <data name="Timeout" xml:space="preserve">
-    <value>시간 초과</value>
+    <value>시간 초과 (초)</value>
   </data>
   <data name="cancelButton_Content" xml:space="preserve">
     <value>취소</value>
diff --git a/shadowsocks-csharp/Localization/Strings.resx b/shadowsocks-csharp/Localization/Strings.resx
index 17d6e307..9348c488 100644
--- a/shadowsocks-csharp/Localization/Strings.resx
+++ b/shadowsocks-csharp/Localization/Strings.resx
@@ -139,7 +139,7 @@
     <value>Port</value>
   </data>
   <data name="Timeout" xml:space="preserve">
-    <value>Timeout</value>
+    <value>Timeout (sec)</value>
   </data>
   <data name="CredentialsOptional" xml:space="preserve">
     <value>Credentials (optional)</value>
diff --git a/shadowsocks-csharp/Localization/Strings.ru.resx b/shadowsocks-csharp/Localization/Strings.ru.resx
index 7c0ceb3d..ce007448 100644
--- a/shadowsocks-csharp/Localization/Strings.ru.resx
+++ b/shadowsocks-csharp/Localization/Strings.ru.resx
@@ -130,7 +130,7 @@
     <value>порт</value>
   </data>
   <data name="Timeout" xml:space="preserve">
-    <value>Таймаут</value>
+    <value>Таймаут (сек)</value>
   </data>
   <data name="cancelButton_Content" xml:space="preserve">
     <value>Отмена</value>
diff --git a/shadowsocks-csharp/Localization/Strings.zh-Hans.resx b/shadowsocks-csharp/Localization/Strings.zh-Hans.resx
index 9ca554ed..f3ef9520 100644
--- a/shadowsocks-csharp/Localization/Strings.zh-Hans.resx
+++ b/shadowsocks-csharp/Localization/Strings.zh-Hans.resx
@@ -148,7 +148,7 @@
     <value>端口</value>
   </data>
   <data name="Timeout" xml:space="preserve">
-    <value>超时</value>
+    <value>超时 (秒)</value>
   </data>
   <data name="okButton_Content" xml:space="preserve">
     <value>确定</value>
diff --git a/shadowsocks-csharp/Localization/Strings.zh-Hant.resx b/shadowsocks-csharp/Localization/Strings.zh-Hant.resx
index 91610dc5..e52f7e3f 100644
--- a/shadowsocks-csharp/Localization/Strings.zh-Hant.resx
+++ b/shadowsocks-csharp/Localization/Strings.zh-Hant.resx
@@ -130,7 +130,7 @@
     <value>位址</value>
   </data>
   <data name="Timeout" xml:space="preserve">
-    <value>逾時</value>
+    <value>逾時 (秒)</value>
   </data>
   <data name="cancelButton_Content" xml:space="preserve">
     <value>取消</value>
diff --git a/shadowsocks-csharp/ViewModels/ForwardProxyViewModel.cs b/shadowsocks-csharp/ViewModels/ForwardProxyViewModel.cs
index 2d9e9bb0..f901cac8 100644
--- a/shadowsocks-csharp/ViewModels/ForwardProxyViewModel.cs
+++ b/shadowsocks-csharp/ViewModels/ForwardProxyViewModel.cs
@@ -33,6 +33,9 @@ namespace Shadowsocks.ViewModels
             Username = _config.proxy.authUser;
             Password = _config.proxy.authPwd;
 
+            this.WhenAnyValue(x => x.NoProxy, x => !x)
+                .ToPropertyEx(this, x => x.CanModifyDetails);
+
             AddressRule = this.ValidationRule(
                 viewModel => viewModel.Address,
                 address => !string.IsNullOrWhiteSpace(address),
@@ -73,6 +76,9 @@ namespace Shadowsocks.ViewModels
         public ReactiveCommand<Unit, Unit> Save { get; }
         public ReactiveCommand<Unit, Unit> Cancel { get; }
 
+        [ObservableAsProperty]
+        public bool CanModifyDetails { get; }
+
         [Reactive]
         public bool NoProxy { get; set; }
 
diff --git a/shadowsocks-csharp/Views/ForwardProxyView.xaml.cs b/shadowsocks-csharp/Views/ForwardProxyView.xaml.cs
index 362696f4..bc9a6658 100644
--- a/shadowsocks-csharp/Views/ForwardProxyView.xaml.cs
+++ b/shadowsocks-csharp/Views/ForwardProxyView.xaml.cs
@@ -40,6 +40,18 @@ namespace Shadowsocks.Views
                     viewModel => viewModel.Timeout,
                     view => view.timeoutTextBox.Text)
                     .DisposeWith(disposables);
+                this.OneWayBind(ViewModel,
+                    viewModel => viewModel.CanModifyDetails,
+                    view => view.addressTextBox.IsEnabled)
+                    .DisposeWith(disposables);
+                this.OneWayBind(ViewModel,
+                    viewModel => viewModel.CanModifyDetails,
+                    view => view.portTextBox.IsEnabled)
+                    .DisposeWith(disposables);
+                this.OneWayBind(ViewModel,
+                    viewModel => viewModel.CanModifyDetails,
+                    view => view.timeoutTextBox.IsEnabled)
+                    .DisposeWith(disposables);
 
                 this.Bind(ViewModel,
                     viewModel => viewModel.Username,