Nixaks Sagepay Form Module

[Beavo1]

I have tried to find a solution to this on the forum and cant see one so any help would be much appreciated.

Our webhosts have told us that they allow outgoing communication on port 43924 but not incoming. The Sagepay form module obviously requires bidrectional comms on this port. Is there a way of configuring the module and/or Sagepay to use a different port for the info that SagePay sends (our incoming port) or for both directions of communication?

Thanks in advance for your help.

We have tested the module and despite what our webhosts told us, it does appear to work but for the sake of other users, perhaps somebody could provide some advice...thanks