DOLS and Reverse Proxy

Hi

I have DOLS running on iSeries with DWA. Users outside the network can access the DWA via an Apache reverse proxy, no problem.

Inside the network the DOLS synchronises fine

Outside the network the following occurs:

Users can download and install the synch software but cannot synch

Is DOLS using port 80?

Does it work via a Reverse Proxy?

If not how to tell Domino to use a different port for DOLS?