Hi, I have opened the following ports between our OWA server in the DMZ and our LAN (80, 691, 389, 3268, 88, 53, 135 and 1024 and above) as per this article http://www.msexchange.org/tutorials/owa_exchange_server_2003.html. My question is what security risk is posed by opening all ports above 1024? I know we can hack the registry on our DCs to limit this but this isn't something I want to do unless I absolutely have to. Any advice would be greatly appreciated. Thanks, Rex.