diff --git a/Client/Client.csproj b/Client/Client.csproj
index 87ce5689..8d9b31d9 100644
--- a/Client/Client.csproj
+++ b/Client/Client.csproj
@@ -311,7 +311,7 @@
   <Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />
   <PropertyGroup>
     <PostBuildEvent Condition="'$(OS)' == 'Windows_NT' ">copy "$(TargetPath)" "$(TargetDir)client.bin" /Y</PostBuildEvent>
-	<PostBuildEvent Condition="'$(OS)' != 'Windows_NT' ">cp "$(TargetPath)" "$(TargetDir)client.bin"</PostBuildEvent>
+    <PostBuildEvent Condition="'$(OS)' != 'Windows_NT' ">cp "$(TargetPath)" "$(TargetDir)client.bin"</PostBuildEvent>
   </PropertyGroup>
   <!-- To modify your build process, add your task inside one of the targets below and uncomment it. 
        Other similar extension points exist, see Microsoft.Common.targets.
diff --git a/Server/Core/Networking/Server.cs b/Server/Core/Networking/Server.cs
index 961ada67..f5e71f89 100644
--- a/Server/Core/Networking/Server.cs
+++ b/Server/Core/Networking/Server.cs
@@ -256,7 +256,9 @@ namespace xServer.Core.Networking
                     if (Socket.OSSupportsIPv6 && ipv6)
                     {
                         _handle = new Socket(AddressFamily.InterNetworkV6, SocketType.Stream, ProtocolType.Tcp);
-                        _handle.SetSocketOption(SocketOptionLevel.IPv6, (SocketOptionName)27, 0);
+                        // fix for mono compatibility, SocketOptionName.IPv6Only
+                        SocketOptionName ipv6only = (SocketOptionName)27;
+                        _handle.SetSocketOption(SocketOptionLevel.IPv6, ipv6only, 0);
                         _handle.Bind(new IPEndPoint(IPAddress.IPv6Any, port));
                     }
                     else