I'm hoping for a bit of advice, on a DiGIR installation issue.

We are trying to migrate our DiGIR system across to a new server infrastructure.  Under the new system, DiGIR needs to be routed via a proxy server when it wishes to contact the outside world (specifically to pick up the XSD file).  I'm not sure how to get DiGIR to do that, so I was hoping you might have some suggestions as to how I proceed.