I've done some searching, but haven't seen this problem listed before so I thought I'd toss it out to the huddled masses. Apologies in advance if I'm missing something obvious... I've got one of my HR21s connected to the net via XE104 power line adapters. The config is: HR21 -> XE104 (1) -> XE104 (2) -> Belkin router -> DSL modem. In this config the HR21 can see the net and use DOD, but when I run Directv2pc on my Dell attached to the Belkin it doesn't discover the HR21. If I attach the Dell to one of the spare ports on the HR21's XE104 (#1 above) it discovers and plays fine. My first thought was that some discovery protocol was getting filtered by the XE104s, but nobody else seems to have that problem (at least not that I could find by searching the forums). I tried to find any specific ports that need to be opened, but didn't see anything there, either. Am I missing something obvious? Thanks again for any help….