WCF Service with SSL and Custom Authentication - vb.net

Question

So I am trying to create a WCF Service that uses SSL and with a Custom Authenticator.
This is the Server config:
<?xml version="1.0"?>
<configuration>
<appSettings>
<add key="aspnet:UseTaskFriendlySynchronizationContext" value="true" />
</appSettings>
<system.web>
<compilation debug="true" strict="false" explicit="true" targetFramework="4.5.2" />
<httpRuntime targetFramework="4.5.2"/>
</system.web>
<system.serviceModel>
<bindings>
<wsHttpBinding>
<binding name="SSL">
<security mode="TransportWithMessageCredential">
<message clientCredentialType="UserName"/>
</security>
</binding>
</wsHttpBinding>
</bindings>
<services>
<service behaviorConfiguration="CustomValidation" name="WCFService.Service1">
<endpoint address="" binding="wsHttpBinding" contract="WCFService.IService1" bindingConfiguration="SSL"/>
<endpoint address="mex" binding="mexHttpsBinding" contract="IMetadataExchange"/>
</service>
</services>
<behaviors>
<serviceBehaviors>
<behavior name="CustomValidation">
<serviceMetadata httpsGetEnabled="true" />
<serviceDebug httpsHelpPageEnabled="true" includeExceptionDetailInFaults="true" />
<serviceCredentials>
<userNameAuthentication userNamePasswordValidationMode="Custom" customUserNamePasswordValidatorType="WCFService.Verification, WCFService" />
</serviceCredentials>
</behavior>
</serviceBehaviors>
</behaviors>
<serviceHostingEnvironment aspNetCompatibilityEnabled="true" multipleSiteBindingsEnabled="false" />
</system.serviceModel>
<system.webServer>
<modules runAllManagedModulesForAllRequests="true"/>
<!--
To browse web app root directory during debugging, set the value below to true.
Set to false before deployment to avoid disclosing web app folder information.
-->
<directoryBrowse enabled="false"/>
</system.webServer>
</configuration>
This is my Validation Class:
Imports System.IdentityModel.Selectors
Public Class Verification
Inherits UserNamePasswordValidator
Public Overrides Sub Validate(userName As String, password As String)
If Not (username = "Admin" AndAlso password = "Fake Password") Then
Throw New Exception("Wrong Username Password combination.")
End If
End Sub
End Class
App Config:
<?xml version="1.0" encoding="utf-8" ?>
<configuration>
<system.diagnostics>
<sources>
<source name="System.ServiceModel.MessageLogging" switchValue="Warning,ActivityTracing">
<listeners>
<add type="System.Diagnostics.DefaultTraceListener" name="Default">
<filter type="" />
</add>
<add name="ServiceModelMessageLoggingListener">
<filter type="" />
</add>
</listeners>
</source>
</sources>
<sharedListeners>
<add initializeData="c:\users\connor smith\documents\visual studio 2015\projects\wcfserviceconsumer\wcfserviceconsumer\app_messages.svclog"
type="System.Diagnostics.XmlWriterTraceListener, System, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089"
name="ServiceModelMessageLoggingListener" traceOutputOptions="Timestamp">
<filter type="" />
</add>
</sharedListeners>
<trace autoflush="true" />
</system.diagnostics>
<startup>
<supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.5.2" />
</startup>
<system.serviceModel>
<diagnostics>
<messageLogging logEntireMessage="true" logMalformedMessages="true"
logMessagesAtTransportLevel="true" />
</diagnostics>
<bindings>
<wsHttpBinding>
<binding name="WSHttpBinding_IService1">
<security mode="TransportWithMessageCredential">
<transport clientCredentialType="None" />
<message clientCredentialType="UserName" />
</security>
</binding>
</wsHttpBinding>
</bindings>
<client>
<endpoint address="https://mysite.co.uk/WCFService/Service1.svc"
binding="wsHttpBinding" bindingConfiguration="WSHttpBinding_IService1"
contract="AService.IService1" name="WSHttpBinding_IService1" />
</client>
</system.serviceModel>
</configuration>
I consume it in a test application, then I set the Username and Password to be Admin and Fake Password, then I go to use the service and get the following error:
Error
Edit: Some more error information:
'An unhandled exception of type 'System.ServiceModel.ProtocolException' occurred in mscorlib.dll'
Am I missing something?