IFS6 u9 Installation IIS Service Page Error

We recently did a fresh IFS6 u9 install.  When we tried bring up the IIS service page we got a "mexHttpBinding" error.

To get past this we had to add a new end point to the config file as below:

<endpoint address="mex" binding="mexHttpBinding" contract="IMetadataExchange" />

<mexHttpsBinding>
          <binding closeTimeout="00:01:00"
                    name="fsm609"
                    openTimeout="00:01:00"
                    receiveTimeout="00:01:00"
                    sendTimeout="00:01:00">
          </binding>
    </mexHttpsBinding>

Any ideas why we had to do this? and why this was not already in the config file? (Im not an IIS guy!)