diff --git a/DnsServerCore/DnsWebService.cs b/DnsServerCore/DnsWebService.cs
index 3345511b..cc088ab9 100644
--- a/DnsServerCore/DnsWebService.cs
+++ b/DnsServerCore/DnsWebService.cs
@@ -550,15 +550,6 @@ namespace DnsServerCore
             bW.WriteShortString(downloadLink);
         }
 
-        public static void CreateUpdateInfov1(Stream s, string version, string displayText, string downloadLink)
-        {
-            BincodingEncoder encoder = new BincodingEncoder(s, "DU", 1);
-
-            encoder.EncodeKeyValue("version", version);
-            encoder.EncodeKeyValue("displayText", displayText);
-            encoder.EncodeKeyValue("downloadLink", downloadLink);
-        }
-
         private void CheckForUpdate(HttpListenerRequest request, JsonTextWriter jsonWriter)
         {
             string updateVersion = null;
@@ -586,49 +577,6 @@ namespace DnsServerCore
 
                             switch (bR.ReadByte()) //version
                             {
-                                case 1:
-                                    #region old version
-
-                                    mS.Position = 0;
-                                    BincodingDecoder decoder = new BincodingDecoder(mS, "DU");
-
-                                    switch (decoder.Version)
-                                    {
-                                        case 1:
-                                            while (true)
-                                            {
-                                                Bincoding entry = decoder.DecodeNext();
-                                                if (entry == null)
-                                                    break;
-
-                                                KeyValuePair<string, Bincoding> value = entry.GetKeyValuePair();
-
-                                                switch (value.Key)
-                                                {
-                                                    case "version":
-                                                        updateVersion = value.Value.GetStringValue();
-
-                                                        updateAvailable = IsUpdateAvailable(_currentVersion, updateVersion);
-                                                        break;
-
-                                                    case "displayText":
-                                                        displayText = value.Value.GetStringValue();
-                                                        break;
-
-                                                    case "downloadLink":
-                                                        downloadLink = value.Value.GetStringValue();
-                                                        break;
-                                                }
-                                            }
-                                            break;
-
-                                        default:
-                                            throw new IOException("File version not supported: " + decoder.Version);
-                                    }
-
-                                    #endregion
-                                    break;
-
                                 case 2:
                                     updateVersion = bR.ReadShortString();
                                     displayText = bR.ReadShortString();
@@ -1536,7 +1484,7 @@ namespace DnsServerCore
 
             if (server == "root-servers")
             {
-                dnsResponse = DnsClient.ResolveViaRootNameServers(domain, type, null, proxy, preferIPv6, protocol, RETRIES);
+                dnsResponse = DnsClient.ResolveViaRootNameServers(domain, type, new SimpleDnsCache(), proxy, preferIPv6, protocol, RETRIES);
             }
             else
             {
@@ -1566,9 +1514,9 @@ namespace DnsServerCore
                         try
                         {
                             if (_dnsServer.AllowRecursion)
-                                nameServer.ResolveDomainName(new NameServerAddress[] { new NameServerAddress(IPAddress.Loopback) }, _dnsServer.Proxy, DnsClientProtocol.Udp, RETRIES);
+                                nameServer.ResolveDomainName(new NameServerAddress[] { new NameServerAddress(IPAddress.Loopback) }, _dnsServer.Proxy, _dnsServer.PreferIPv6, DnsClientProtocol.Udp, RETRIES);
                             else
-                                nameServer.RecursiveResolveDomainName(_dnsServer.Cache, _dnsServer.Proxy, DnsClient.RecursiveResolveDefaultProtocol, RETRIES);
+                                nameServer.RecursiveResolveDomainName(_dnsServer.Cache, _dnsServer.Proxy, _dnsServer.PreferIPv6, DnsClient.RecursiveResolveDefaultProtocol, RETRIES);
                         }
                         catch
                         { }
@@ -1743,11 +1691,6 @@ namespace DnsServerCore
 
                 switch (bR.ReadByte())
                 {
-                    case 1:
-                        fS.Position = 0;
-                        LoadZoneFileV1(fS);
-                        break;
-
                     case 2:
                         int count = bR.ReadInt32();
                         DnsResourceRecord[] records = new DnsResourceRecord[count];
@@ -1766,28 +1709,6 @@ namespace DnsServerCore
             _log.Write("Loaded zone file: " + zoneFile);
         }
 
-        private void LoadZoneFileV1(Stream s)
-        {
-            BincodingDecoder decoder = new BincodingDecoder(s, "DZ");
-
-            switch (decoder.Version)
-            {
-                case 1:
-                    ICollection<Bincoding> entries = decoder.DecodeNext().GetList();
-                    DnsResourceRecord[] records = new DnsResourceRecord[entries.Count];
-
-                    int i = 0;
-                    foreach (Bincoding entry in entries)
-                        records[i++] = new DnsResourceRecord(entry.GetValueStream());
-
-                    _dnsServer.AuthoritativeZoneRoot.SetRecords(records);
-                    break;
-
-                default:
-                    throw new IOException("Dns Zone file version not supported: " + decoder.Version);
-            }
-        }
-
         private void SaveZoneFile(string domain)
         {
             domain = domain.ToLower();
@@ -1836,11 +1757,6 @@ namespace DnsServerCore
                     byte version = bR.ReadByte();
                     switch (version)
                     {
-                        case 1:
-                            fS.Position = 0;
-                            LoadConfigFileV1(fS);
-                            break;
-
                         case 2:
                         case 3:
                         case 4:
@@ -1938,79 +1854,6 @@ namespace DnsServerCore
             }
         }
 
-        private void LoadConfigFileV1(Stream s)
-        {
-            BincodingDecoder decoder = new BincodingDecoder(s, "DS");
-
-            switch (decoder.Version)
-            {
-                case 1:
-                    while (true)
-                    {
-                        Bincoding item = decoder.DecodeNext();
-                        if (item.Type == BincodingType.NULL)
-                            break;
-
-                        if (item.Type == BincodingType.KEY_VALUE_PAIR)
-                        {
-                            KeyValuePair<string, Bincoding> pair = item.GetKeyValuePair();
-
-                            switch (pair.Key)
-                            {
-                                case "serverDomain":
-                                    _serverDomain = pair.Value.GetStringValue();
-                                    break;
-
-                                case "webServicePort":
-                                    _webServicePort = pair.Value.GetIntegerValue();
-                                    break;
-
-                                case "dnsPreferIPv6":
-                                    _dnsServer.PreferIPv6 = pair.Value.GetBooleanValue();
-                                    break;
-
-                                case "logQueries":
-                                    if (pair.Value.GetBooleanValue())
-                                        _dnsServer.QueryLogManager = _log;
-
-                                    break;
-
-                                case "dnsAllowRecursion":
-                                    _dnsServer.AllowRecursion = pair.Value.GetBooleanValue();
-                                    break;
-
-                                case "dnsForwarders":
-                                    ICollection<Bincoding> entries = pair.Value.GetList();
-                                    NameServerAddress[] forwarders = new NameServerAddress[entries.Count];
-
-                                    int i = 0;
-                                    foreach (Bincoding entry in entries)
-                                        forwarders[i++] = new NameServerAddress(IPAddress.Parse(entry.GetStringValue()));
-
-                                    _dnsServer.Forwarders = forwarders;
-                                    break;
-
-                                case "credentials":
-                                    foreach (KeyValuePair<string, Bincoding> credential in pair.Value.GetDictionary())
-                                        SetCredentials(credential.Key, credential.Value.GetStringValue());
-
-                                    break;
-
-                                case "disabledZones":
-                                    foreach (Bincoding disabledZone in pair.Value.GetList())
-                                        _dnsServer.AuthoritativeZoneRoot.DisableZone(disabledZone.GetStringValue());
-
-                                    break;
-                            }
-                        }
-                    }
-                    break;
-
-                default:
-                    throw new IOException("Dns Config file version not supported: " + decoder.Version);
-            }
-        }
-
         private void SaveConfigFile()
         {
             string configFile = Path.Combine(_configFolder, "dns.config");