How to setup WCF with wsHttpBinding, Transport Security with x509 certificate behind a load balancer (F5)

Question

I'm having a difficult time setting up this WCF Service with wsHttpBinding, Transport Security, x509 and, the key part, the Load Balancer (F5). This all works without a problem in our Dev environment but as soon as I put it behind the F5 it fails giving me this message:

System.ServiceModel.Security.SecurityNegotiationException: Could not establish trust relationship for the SSL/TLS secure channel with authority 'servicechannelcert'. ---> System.Net.WebException: The underlying connection was closed: Could not establish trust relationship for the SSL/TLS secure channel. ---> System.Security.Authentication.AuthenticationException: The remote certificate is invalid according to the validation procedure.

Is there any additional setup I need to do in IIS or the Load Balancer to handle these requests?

Any help would be appreciated.

Below is the configuration files:

<binding name="wsHttpTransport">
  <readerQuotas maxDepth="2147483647" maxStringContentLength="2147483647" maxArrayLength="2147483647"
    maxBytesPerRead="2147483647" maxNameTableCharCount="2147483647" />
  <security mode="Transport">
    <transport clientCredentialType="Certificate" />
  </security>

<service behaviorConfiguration="ChannelServiceBehavior" name="TestService">
<endpoint address=""
          binding="wsHttpBinding"
          bindingConfiguration="wsHttpTransport"
          contract="TestService" />
<endpoint address="mex"
          binding="wsHttpBinding"
          bindingConfiguration="wsHttpTransport"
          contract="IMetadataExchange"/>

<behavior name="ChannelServiceBehavior">
  <serviceMetadata httpsGetEnabled="true"/>
  <serviceDebug includeExceptionDetailInFaults="false"/>
  <serviceCredentials>
    <serviceCertificate findValue="x509-Dev" x509FindType="FindBySubjectName" storeLocation="LocalMachine" storeName="My" />
    <clientCertificate>
      <authentication certificateValidationMode="PeerTrust" />
    </clientCertificate>
  </serviceCredentials>
</behavior>