VMWare View PCoIP Black Screen

I have implemented VMWare View 5.1 in a test environment and looks like im at the final hurdle.  The problem i have is when trying to connect externally using PCoIP i get a black Screen and then an error saying " The Connection to the remote computer ended".  Using RDP it works fine.  Using the Vlient Internally works fine too.  I have also logged in internally using PCoIP and tried Opening the Same Session Externally and it kicks the internal Session off but i still get the black screen with the error message.