Something strange must be going on here. From the web interface, I cannot turn the main zone on and off. When I connect via the web, the main page is pretty slow to display, and the main zone power on/off buttons are even slower to come up. They finally do appear, and then when I click on power on, nothing happens. This at one point did work, and I'm not sure I changed anything, but now it doesn't. At the same time, my custom control program that connects to the telnet port, gets a constant stream of nulls. This is pretty frustrating, and a serious defect of the product. They advertise both the ethernet control and web interface as features of this product, and they do not work correctly. Frankly, this is really bad news.