Address Book GAL status is shown as the internal address

I have an issue with the GAL address book address being set to the internal address in OCS 2007 R2. I need it to be set to an external address so that external users can access this correctly. Does anyone know how to do this? I have tried with WBEMTEST and it continually crashes when I try to access the DB to change this account. 

Does anyone know how to change this or to fix the error that I am getting when trying to access the DB via WBEMTEST.

Thanks

Mike