Data Analysis Views external to domain

[foonz]

I have an issue with a hosted Implementation of Project Server 2007.
Internally all the Data Analysis Views display as expected.
When we connect to the Project Server 2007 farm via PWA from an external location ( or today as we tested from an internal non AD domain workstation) we get error messages on the data analysis such as(See attached)
The query could not be processed:
oCannot connect to the Server 'Server-Name'. The server is either not started or too busy.


I have implemented an http pump on my Analysis Services server
(anonymous and windows password authentication) however i'm not sure if i should then configure anything on my EPM/Project 2007 server installation.

Any suggestions would be gratefully received.

thanks
fOonz