905 Issues with Open4 Employee Self Serve

Has anyone else experienced any issues in the installation of employee self serve?  We currently installed Epicor 905.702 along with Open4 and they both seem to function fine.  However, when attempting to install Employee Self Serve, I am unable to log in?  We are running server 2008 r2 standard with IIS 7 running.  I have worked with Epicor and also the company that created Open4 (HRO Unicorn) and they are unable to get this to work.  Is there some sort of something special that MUST be done, that I am missing?