DT Pro: Import Site - doesn't work via proxies

When I am connected at home via DHCP via TimeWarner RoadRunner I am able to import sites w/o problem. However, when connected at work I cannot seem to import any sites. I used DT as a dB for work related data and being able to import internal work web sites is critical for this data management. The only thing I can think of that is different at work vs. at home is at work the web connection is via proxies.

Any ideas?