Harry,
You've got the picture. I used modified firmware for my LS-WVL to enable root access, then installed optware, I can run SAB, sickbeard, couchpotato, headphones... even LazyLibrarian, and have it always on using about 15 watts. (Lol, I sound like I work for Buffalo; I don't, but I'm pretty pleased with it, as you can tell.)
So yeah, I have my home IP configured with a DDNS, with the appropriate ports forwarded to the NAS. Mediadog is configured to query the ports on the DDNS host. With the built-in router on the SBG6580, it didn't seem to matter whether I used the DDNS or the local ip in my query, whether I was doing it from Mediadog or a network pc.
From what you're saying, it looks like this may simply be a feature (loopback?) that the 865L lacks, which is kind of surprising, since I always figured the SBG6580 had POS software.
In general, things are working--however, I'd love to fix this, because I'd have to select a different host every time I'm at home and want to use Mediadog, which, being an American, is simply way too much work for me.
Now, however, it looks like I'm simply at PhantomMike's issue.