diff --git a/examples/WireMock.Net.StandAlone.NETCoreApp/WireMock.Net.StandAlone.NETCoreApp.csproj b/examples/WireMock.Net.StandAlone.NETCoreApp/WireMock.Net.StandAlone.NETCoreApp.csproj
index 17a7b614..6b7ea76f 100644
--- a/examples/WireMock.Net.StandAlone.NETCoreApp/WireMock.Net.StandAlone.NETCoreApp.csproj
+++ b/examples/WireMock.Net.StandAlone.NETCoreApp/WireMock.Net.StandAlone.NETCoreApp.csproj
@@ -2,7 +2,7 @@
 
   <PropertyGroup>
     <OutputType>Exe</OutputType>
-    <TargetFrameworks>netcoreapp1.1;netcoreapp2.0</TargetFrameworks>
+    <TargetFrameworks>netcoreapp2.0;netcoreapp1.1</TargetFrameworks>
     <ApplicationIcon>../../WireMock.Net-Logo.ico</ApplicationIcon>
   </PropertyGroup>
 
diff --git a/examples/WireMock.Net.StandAlone.Net452/Program.cs b/examples/WireMock.Net.StandAlone.Net452/Program.cs
index 3bba04b1..36bd441f 100644
--- a/examples/WireMock.Net.StandAlone.Net452/Program.cs
+++ b/examples/WireMock.Net.StandAlone.Net452/Program.cs
@@ -1,6 +1,6 @@
 using System;
 
-namespace WireMock.Net.StandAlone
+namespace WireMock.Net.StandAlone.Net452
 {
     public class Program
     {
diff --git a/examples/WireMock.Net.StandAlone.Net452/WireMock.Net.StandAlone.Net452.csproj b/examples/WireMock.Net.StandAlone.Net452/WireMock.Net.StandAlone.Net452.csproj
index 7729b6cd..81075ad1 100644
--- a/examples/WireMock.Net.StandAlone.Net452/WireMock.Net.StandAlone.Net452.csproj
+++ b/examples/WireMock.Net.StandAlone.Net452/WireMock.Net.StandAlone.Net452.csproj
@@ -7,8 +7,8 @@
     <ProjectGuid>{668F689E-57B4-422E-8846-C0FF643CA999}</ProjectGuid>
     <OutputType>Exe</OutputType>
     <AppDesignerFolder>Properties</AppDesignerFolder>
-    <RootNamespace>WireMock.Net.StandAlone</RootNamespace>
-    <AssemblyName>WireMock.Net.StandAlone</AssemblyName>
+    <RootNamespace>WireMock.Net.StandAlone.Net452</RootNamespace>
+    <AssemblyName>WireMock.Net.StandAlone.Net452</AssemblyName>
     <TargetFrameworkVersion>v4.5.2</TargetFrameworkVersion>
     <FileAlignment>512</FileAlignment>
     <AutoGenerateBindingRedirects>true</AutoGenerateBindingRedirects>
@@ -35,38 +35,15 @@
   <PropertyGroup>
     <ApplicationIcon>..\..\WireMock.Net-Logo.ico</ApplicationIcon>
   </PropertyGroup>
+  <PropertyGroup>
+    <StartupObject>WireMock.Net.StandAlone.Net452.Program</StartupObject>
+  </PropertyGroup>
   <ItemGroup>
-    <Reference Include="Handlebars, Version=1.8.1.0, Culture=neutral, PublicKeyToken=22225d0bf33cd661, processorArchitecture=MSIL">
-      <HintPath>..\..\packages\Handlebars.Net.1.9.0\lib\net40\Handlebars.dll</HintPath>
-    </Reference>
-    <Reference Include="Microsoft.Owin.Host.HttpListener, Version=3.1.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL">
-      <HintPath>..\..\packages\Microsoft.Owin.Host.HttpListener.3.1.0\lib\net45\Microsoft.Owin.Host.HttpListener.dll</HintPath>
-    </Reference>
-    <Reference Include="Newtonsoft.Json, Version=9.0.0.0, Culture=neutral, PublicKeyToken=30ad4fe6b2a6aeed, processorArchitecture=MSIL">
-      <HintPath>..\..\packages\Newtonsoft.Json.9.0.1\lib\net45\Newtonsoft.Json.dll</HintPath>
-    </Reference>
-    <Reference Include="RestEase, Version=1.4.1.0, Culture=neutral, processorArchitecture=MSIL">
-      <HintPath>..\..\packages\RestEase.1.4.1\lib\net45\RestEase.dll</HintPath>
-    </Reference>
-    <Reference Include="SimMetrics.Net, Version=1.0.3.0, Culture=neutral, processorArchitecture=MSIL">
-      <HintPath>..\..\packages\SimMetrics.Net.1.0.3\lib\net45\SimMetrics.Net.dll</HintPath>
-    </Reference>
     <Reference Include="System" />
     <Reference Include="System.Core" />
     <Reference Include="System.Numerics" />
     <Reference Include="System.Xml" />
     <Reference Include="System.Xml.Linq" />
-    <Reference Include="WireMock.Net, Version=1.0.2.0, Culture=neutral, processorArchitecture=MSIL">
-      <SpecificVersion>False</SpecificVersion>
-      <HintPath>..\..\src\WireMock.Net.StandAlone\bin\$(Configuration)\net452\WireMock.Net.dll</HintPath>
-    </Reference>
-    <Reference Include="WireMock.Net.StandAlone, Version=1.0.0.0, Culture=neutral, processorArchitecture=MSIL">
-      <SpecificVersion>False</SpecificVersion>
-      <HintPath>..\..\src\WireMock.Net.StandAlone\bin\$(Configuration)\net452\WireMock.Net.StandAlone.dll</HintPath>
-    </Reference>
-    <Reference Include="XPath2, Version=1.0.3.1, Culture=neutral, processorArchitecture=MSIL">
-      <HintPath>..\..\packages\XPath2.1.0.3.1\lib\net452\XPath2.dll</HintPath>
-    </Reference>
   </ItemGroup>
   <ItemGroup>
     <Compile Include="Program.cs" />
@@ -75,6 +52,16 @@
   <ItemGroup>
     <None Include="packages.config" />
   </ItemGroup>
+  <ItemGroup>
+    <ProjectReference Include="..\..\src\WireMock.Net.StandAlone\WireMock.Net.StandAlone.csproj">
+      <Project>{b6269aac-170a-43d5-8b9a-579ded3d9a95}</Project>
+      <Name>WireMock.Net.StandAlone</Name>
+    </ProjectReference>
+    <ProjectReference Include="..\..\src\WireMock.Net\WireMock.Net.csproj">
+      <Project>{d3804228-91f4-4502-9595-39584e5a01ad}</Project>
+      <Name>WireMock.Net</Name>
+    </ProjectReference>
+  </ItemGroup>
   <Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />
   <!-- 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/examples/WireMock.Net.StandAlone.Net452/packages.config b/examples/WireMock.Net.StandAlone.Net452/packages.config
index efe01026..6b8deb9c 100644
--- a/examples/WireMock.Net.StandAlone.Net452/packages.config
+++ b/examples/WireMock.Net.StandAlone.Net452/packages.config
@@ -1,9 +1,3 @@
 <?xml version="1.0" encoding="utf-8"?>
 <packages>
-  <package id="Handlebars.Net" version="1.9.0" targetFramework="net452" />
-  <package id="Microsoft.Owin.Host.HttpListener" version="3.1.0" targetFramework="net452" />
-  <package id="Newtonsoft.Json" version="9.0.1" targetFramework="net452" />
-  <package id="RestEase" version="1.4.1" targetFramework="net452" />
-  <package id="SimMetrics.Net" version="1.0.3" targetFramework="net452" />
-  <package id="XPath2" version="1.0.3.1" targetFramework="net452" />
 </packages>
\ No newline at end of file
diff --git a/src/WireMock.Net/Owin/AspNetCoreSelfHost.cs b/src/WireMock.Net/Owin/AspNetCoreSelfHost.cs
index ea6777c8..b4f6857e 100644
--- a/src/WireMock.Net/Owin/AspNetCoreSelfHost.cs
+++ b/src/WireMock.Net/Owin/AspNetCoreSelfHost.cs
@@ -5,8 +5,6 @@ using System.Threading.Tasks;
 using JetBrains.Annotations;
 using Microsoft.AspNetCore.Builder;
 using Microsoft.AspNetCore.Hosting;
-using Microsoft.Extensions.DependencyInjection;
-using Microsoft.Extensions.Logging;
 using WireMock.Http;
 using WireMock.Validation;
 
@@ -18,6 +16,8 @@ namespace WireMock.Owin
         private readonly WireMockMiddlewareOptions _options;
         private readonly string[] _uriPrefixes;
 
+        private IWebHost _host;
+
         public bool IsStarted { get; private set; }
 
         public List<string> Urls { get; } = new List<string>();
@@ -33,9 +33,7 @@ namespace WireMock.Owin
             {
                 Urls.Add(uriPrefix);
 
-                int port;
-                string host;
-                PortUtil.TryExtractProtocolAndPort(uriPrefix, out host, out port);
+                PortUtil.TryExtractProtocolAndPort(uriPrefix, out string host, out int port);
                 Ports.Add(port);
             }
 
@@ -45,27 +43,26 @@ namespace WireMock.Owin
 
         public Task StartAsync()
         {
-            IWebHost host = new WebHostBuilder()
-                    // .ConfigureLogging(factory => factory.AddConsole(LogLevel.None))
-                    .Configure(appBuilder =>
-                    {
-                        appBuilder.UseMiddleware<WireMockMiddleware>(_options);
-                    })
-                    .UseKestrel()
-                    .UseUrls(_uriPrefixes)
-                    .Build();
+            _host = new WebHostBuilder()
+                .Configure(appBuilder =>
+                {
+                    appBuilder.UseMiddleware<WireMockMiddleware>(_options);
+                })
+                .UseKestrel()
+                .UseUrls(_uriPrefixes)
+                .Build();
 
 #if NETSTANDARD1_3
             System.Console.WriteLine("WireMock.Net server using netstandard1.3");
             return Task.Run(() =>
             {
-                host.Run(_cts.Token);
+                _host.Run(_cts.Token);
                 IsStarted = true;
             }, _cts.Token);
 #else
             System.Console.WriteLine("WireMock.Net server using netstandard2.0");
             IsStarted = true;
-            return host.RunAsync(_cts.Token);
+            return _host.RunAsync(_cts.Token);
 #endif
         }
 
@@ -74,8 +71,11 @@ namespace WireMock.Owin
             _cts.Cancel();
 
             IsStarted = false;
-
+#if NETSTANDARD1_3
             return Task.FromResult(true);
+#else
+            return _host.WaitForShutdownAsync();
+#endif
         }
     }
 }
diff --git a/src/WireMock.Net/Server/FluentMockServer.cs b/src/WireMock.Net/Server/FluentMockServer.cs
index 7e953987..c205560a 100644
--- a/src/WireMock.Net/Server/FluentMockServer.cs
+++ b/src/WireMock.Net/Server/FluentMockServer.cs
@@ -4,6 +4,7 @@ using System.Collections.Generic;
 using System.Collections.ObjectModel;
 using System.Linq;
 using System.Text;
+using System.Threading.Tasks;
 using JetBrains.Annotations;
 using WireMock.Http;
 using WireMock.Matchers;
@@ -20,6 +21,7 @@ namespace WireMock.Server
     /// </summary>
     public partial class FluentMockServer : IDisposable
     {
+        private const int ServerStartDelay = 100;
         private readonly IOwinSelfHost _httpServer;
         private readonly object _syncRoot = new object();
         private readonly WireMockMiddlewareOptions _options = new WireMockMiddlewareOptions();
@@ -173,6 +175,9 @@ namespace WireMock.Server
 
             _httpServer.StartAsync();
 
+            // Fix for 'Bug: Server not listening after Start() returns (on macOS)'
+            Task.Delay(ServerStartDelay).Wait();
+
             if (settings.AllowPartialMapping == true)
             {
                 AllowPartialMapping();
@@ -318,7 +323,10 @@ namespace WireMock.Server
             Check.NotNull(password, nameof(password));
 
             string authorization = Convert.ToBase64String(Encoding.GetEncoding("ISO-8859-1").GetBytes(username + ":" + password));
-            _options.AuthorizationMatcher = new RegexMatcher("^(?i)BASIC " + authorization + "$");
+            lock (_syncRoot)
+            {
+                _options.AuthorizationMatcher = new RegexMatcher("^(?i)BASIC " + authorization + "$");
+            }
         }
 
         /// <summary>
@@ -327,7 +335,10 @@ namespace WireMock.Server
         [PublicAPI]
         public void RemoveBasicAuthentication()
         {
-            _options.AuthorizationMatcher = null;
+            lock (_syncRoot)
+            {
+                _options.AuthorizationMatcher = null;
+            }
         }
 
         /// <summary>
@@ -337,7 +348,10 @@ namespace WireMock.Server
         [PublicAPI]
         public void SetMaxRequestLogCount([CanBeNull] int? maxRequestLogCount)
         {
-            _options.MaxRequestLogCount = maxRequestLogCount;
+            lock (_syncRoot)
+            {
+                _options.MaxRequestLogCount = maxRequestLogCount;
+            }
         }
 
         /// <summary>
@@ -347,7 +361,10 @@ namespace WireMock.Server
         [PublicAPI]
         public void SetRequestLogExpirationDuration([CanBeNull] int? requestLogExpirationDuration)
         {
-            _options.RequestLogExpirationDuration = requestLogExpirationDuration;
+            lock (_syncRoot)
+            {
+                _options.RequestLogExpirationDuration = requestLogExpirationDuration;
+            }
         }
 
         /// <summary>