diff --git a/shadowsocks-csharp/Util/SystemProxy/RAS.cs b/shadowsocks-csharp/Util/SystemProxy/RAS.cs
index 36066a6f..19f6c78b 100644
--- a/shadowsocks-csharp/Util/SystemProxy/RAS.cs
+++ b/shadowsocks-csharp/Util/SystemProxy/RAS.cs
@@ -1,13 +1,8 @@
-using System;
-using System.Collections.Generic;
-using System.Linq;
-using System.Runtime.InteropServices;
-using System.Text;
-using System.Threading.Tasks;
+using System.Runtime.InteropServices;
 
 namespace Shadowsocks.Util.SystemProxy
 {
-    public static class RAS
+    internal static class RemoteAccessService
     {
         private enum RasFieldSizeConstants
         {
@@ -69,22 +64,28 @@ namespace Shadowsocks.Util.SystemProxy
             #endregion
 
             public int dwSize;
+
             [MarshalAs(UnmanagedType.ByValTStr, SizeConst=(int)RasFieldSizeConstants.RAS_MaxEntryName + 1)]
             public string szEntryName;
 
             public int dwFlags;
 
-            [MarshalAs(UnmanagedType.ByValTStr,SizeConst=(int)RasFieldSizeConstants.RAS_MaxPath + 1)]
+            [MarshalAs(UnmanagedType.ByValTStr, SizeConst=(int)RasFieldSizeConstants.RAS_MaxPath + 1)]
             public string szPhonebookPath;
         }
 
         [DllImport("rasapi32.dll", CharSet = CharSet.Auto)]
         private static extern uint RasEnumEntries(
-            string reserved, // reserved, must be NULL
-            string lpszPhonebook, // pointer to full path and file name of phone-book file
-            [In, Out] RasEntryName[] lprasentryname, // buffer to receive phone-book entries
-            ref int lpcb, // size in bytes of buffer
-            out int lpcEntries // number of entries written to buffer
+            // reserved, must be NULL
+            string reserved,
+            // pointer to full path and file name of phone-book file
+            string lpszPhonebook,
+            // buffer to receive phone-book entries
+            [In, Out] RasEntryName[] lprasentryname,
+            // size in bytes of buffer
+            ref int lpcb,
+            // number of entries written to buffer
+            out int lpcEntries
         );
 
         /// <summary>
diff --git a/shadowsocks-csharp/Util/SystemProxy/WinINet.cs b/shadowsocks-csharp/Util/SystemProxy/WinINet.cs
index a24d1197..c5dddee9 100644
--- a/shadowsocks-csharp/Util/SystemProxy/WinINet.cs
+++ b/shadowsocks-csharp/Util/SystemProxy/WinINet.cs
@@ -136,15 +136,6 @@ namespace Shadowsocks.Util.SystemProxy
 
             // Notify the system that the registry settings have been changed and cause
             // the proxy data to be reread from the registry for a handle.
-//            bReturn = NativeMethods.InternetSetOption(
-//                IntPtr.Zero,
-//                INTERNET_OPTION.INTERNET_OPTION_SETTINGS_CHANGED,
-//                IntPtr.Zero, 0);
-//            if ( ! bReturn )
-//            {
-//                Logging.Error("InternetSetOption:INTERNET_OPTION_SETTINGS_CHANGED");
-//            }
-
             bReturn = NativeMethods.InternetSetOption(
                 IntPtr.Zero,
                 INTERNET_OPTION.INTERNET_OPTION_PROXY_SETTINGS_CHANGED,
@@ -167,7 +158,7 @@ namespace Shadowsocks.Util.SystemProxy
         public static void SetIEProxy(bool enable, bool global, string proxyServer, string pacURL)
         {
             string[] allConnections = null;
-            var ret = RAS.GetAllConns(ref allConnections);
+            var ret = RemoteAccessService.GetAllConns(ref allConnections);
 
             if (ret == 2)
                 throw new Exception("Cannot get all connections");
diff --git a/shadowsocks-csharp/Util/Util.cs b/shadowsocks-csharp/Util/Util.cs
index 60a748e2..9050aeb9 100755
--- a/shadowsocks-csharp/Util/Util.cs
+++ b/shadowsocks-csharp/Util/Util.cs
@@ -1,11 +1,8 @@
 using System;
-using System.Collections.Generic;
 using System.Diagnostics;
 using System.IO;
 using System.IO.Compression;
-using System.Linq;
 using System.Runtime.InteropServices;
-using System.Security;
 using System.Windows.Forms;
 using Microsoft.Win32;
 using Shadowsocks.Controller;
@@ -224,19 +221,14 @@ namespace Shadowsocks.Util
                     .OpenSubKey(name, writable);
                 return userKey;
             }
-            catch (UnauthorizedAccessException uae)
-            {
-                Logging.LogUsefulException(uae);
-                return null;
-            }
-            catch (SecurityException se)
+            catch (ArgumentException ae)
             {
-                Logging.LogUsefulException(se);
+                MessageBox.Show("OpenRegKey: " + ae.ToString());
                 return null;
             }
-            catch (ArgumentException ae)
+            catch (Exception e)
             {
-                MessageBox.Show("OpenRegKey: " + ae.ToString());
+                Logging.LogUsefulException(e);
                 return null;
             }
         }