diff --git a/.gitignore b/.gitignore
index 7964536..1b0e567 100644
--- a/.gitignore
+++ b/.gitignore
@@ -186,4 +186,5 @@
 # LightSwitch generated files
 GeneratedArtifacts/
 _Pvt_Extensions/
-ModelManifest.xml
\ No newline at end of file
+ModelManifest.xml
+.vs
diff --git a/Sunfish/Sunfish/HttpServer.cs b/Sunfish/Sunfish/HttpServer.cs
index 00de905..41c1f54 100644
--- a/Sunfish/Sunfish/HttpServer.cs
+++ b/Sunfish/Sunfish/HttpServer.cs
@@ -45,7 +45,6 @@
             }
             loop = new Thread(ServerLoop);
             loop.Start();
-            fwRule = WindowsFirewall.Allow(port);
             return true;
         }
 
@@ -106,7 +105,6 @@
             }
             finally
             {
-                WindowsFirewall.Remove(fwRule);
             }
             return true;
         }
@@ -266,16 +264,13 @@
 
     public class LogError
     {
-        private DateTime time = DateTime.Now;
-        private Exception e;
-
         public LogError(Exception e)
         {
-            this.e = e;
+            Exception = e;
         }
 
-        public DateTime Time { get { return time; } }
-        public Exception Exception { get { return e; } }
+        public DateTime Time { get; } = DateTime.Now;
+        public Exception Exception { get; }
     }
 
     public class HttpPost
diff --git a/Sunfish/Sunfish/Program.cs b/Sunfish/Sunfish/Program.cs
index 3757a97..c67c83b 100644
--- a/Sunfish/Sunfish/Program.cs
+++ b/Sunfish/Sunfish/Program.cs
@@ -1,8 +1,6 @@
-using System;
-using System.Collections.Generic;
-using System.Linq;
+using DolphinWebXplorer2.wx;
+using System;
 using System.Windows.Forms;
-using DolphinWebXplorer2.wx;
 
 namespace DolphinWebXplorer2
 {
@@ -20,7 +18,7 @@
             Application.SetCompatibleTextRenderingDefault(false);
             try
             {
-                Application.Run(mainform=new Form1());
+                Application.Run(mainform = new Form1());
             }
             finally
             {
diff --git a/Sunfish/Sunfish/Properties/Resources.Designer.cs b/Sunfish/Sunfish/Properties/Resources.Designer.cs
index 3795ac1..ae0a542 100644
--- a/Sunfish/Sunfish/Properties/Resources.Designer.cs
+++ b/Sunfish/Sunfish/Properties/Resources.Designer.cs
@@ -1,7 +1,7 @@
 //------------------------------------------------------------------------------
 // <auto-generated>
 //     This code was generated by a tool.
-//     Runtime Version:4.0.30319.34209
+//     Runtime Version:4.0.30319.42000
 //
 //     Changes to this file may cause incorrect behavior and will be lost if
 //     the code is regenerated.
@@ -19,7 +19,7 @@
     // class via a tool like ResGen or Visual Studio.
     // To add or remove a member, edit your .ResX file then rerun ResGen
     // with the /str option, or rebuild your VS project.
-    [global::System.CodeDom.Compiler.GeneratedCodeAttribute("System.Resources.Tools.StronglyTypedResourceBuilder", "4.0.0.0")]
+    [global::System.CodeDom.Compiler.GeneratedCodeAttribute("System.Resources.Tools.StronglyTypedResourceBuilder", "15.0.0.0")]
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute()]
     [global::System.Runtime.CompilerServices.CompilerGeneratedAttribute()]
     internal class Resources {
diff --git a/Sunfish/Sunfish/Properties/Settings.Designer.cs b/Sunfish/Sunfish/Properties/Settings.Designer.cs
index ec38d51..50ca31b 100644
--- a/Sunfish/Sunfish/Properties/Settings.Designer.cs
+++ b/Sunfish/Sunfish/Properties/Settings.Designer.cs
@@ -1,7 +1,7 @@
 //------------------------------------------------------------------------------
 // <auto-generated>
 //     This code was generated by a tool.
-//     Runtime Version:4.0.30319.34209
+//     Runtime Version:4.0.30319.42000
 //
 //     Changes to this file may cause incorrect behavior and will be lost if
 //     the code is regenerated.
@@ -12,7 +12,7 @@
     
     
     [global::System.Runtime.CompilerServices.CompilerGeneratedAttribute()]
-    [global::System.CodeDom.Compiler.GeneratedCodeAttribute("Microsoft.VisualStudio.Editors.SettingsDesigner.SettingsSingleFileGenerator", "12.0.0.0")]
+    [global::System.CodeDom.Compiler.GeneratedCodeAttribute("Microsoft.VisualStudio.Editors.SettingsDesigner.SettingsSingleFileGenerator", "15.8.0.0")]
     internal sealed partial class Settings : global::System.Configuration.ApplicationSettingsBase {
         
         private static Settings defaultInstance = ((Settings)(global::System.Configuration.ApplicationSettingsBase.Synchronized(new Settings())));
diff --git a/Sunfish/Sunfish/Sunfish.csproj b/Sunfish/Sunfish/Sunfish.csproj
index 0c05f0e..7649cf2 100644
--- a/Sunfish/Sunfish/Sunfish.csproj
+++ b/Sunfish/Sunfish/Sunfish.csproj
@@ -10,7 +10,7 @@
     <AppDesignerFolder>Properties</AppDesignerFolder>
     <RootNamespace>DolphinWebXplorer2</RootNamespace>
     <AssemblyName>Sunfish</AssemblyName>
-    <TargetFrameworkVersion>v3.5</TargetFrameworkVersion>
+    <TargetFrameworkVersion>v4.0</TargetFrameworkVersion>
     <FileAlignment>512</FileAlignment>
     <ApplicationIcon>sunfishWebServer.ico</ApplicationIcon>
     <StartupObject>
@@ -35,6 +35,7 @@
     <IsWebBootstrapper>false</IsWebBootstrapper>
     <UseApplicationTrust>false</UseApplicationTrust>
     <BootstrapperEnabled>true</BootstrapperEnabled>
+    <TargetFrameworkProfile />
   </PropertyGroup>
   <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' ">
     <DebugSymbols>true</DebugSymbols>
@@ -128,6 +129,7 @@
       <DependentUpon>Resources.resx</DependentUpon>
       <DesignTime>True</DesignTime>
     </Compile>
+    <None Include="app.config" />
     <None Include="app.manifest" />
     <None Include="Properties\Settings.settings">
       <Generator>SettingsSingleFileGenerator</Generator>
diff --git a/Sunfish/Sunfish/app.config b/Sunfish/Sunfish/app.config
new file mode 100644
index 0000000..fcd0c93
--- /dev/null
+++ b/Sunfish/Sunfish/app.config
@@ -0,0 +1,3 @@
+<?xml version="1.0" encoding="utf-8"?>
+<configuration>
+<startup><supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.0"/></startup></configuration>