Hi there, I´m having the same DLNA error message using a PS3 (fw version 3,42 by now) and a DLink DIR-685 (fw 2.0ww). I spent A LOT of time fiddling around with the settings, getting increasingly frustrated about the gap between advertising an realitiy concerning DLNA.
Whatever, the main problem seems to be that the DIR-685 is painstakingly slow in refreshing the media content. Try a chosing very small folder (not root or the HDD, but a subdirectory) with a dozen pictures or songs in it as streaming sorce and press "refresh". Wait until the DIR-685 finishes refreshing, then let the PS3 search for new media servers. I found out that everything works out fine then.
BUT: when I chose my whole music and pictures folders (about 60 gig, including HD videos), the DIR-685 will not finish refreshing. The firmware is so buggy that it will log you out before the refreshing finishes. Result on the PS3: DLNA protocol error 2114.
Oos, sorry, I should have posted it in the DIR-685 section but the firmware - and the error for sure - is probably the same. Maybe someone can move the post...
So in the end, I could avoid the 2114 error when chosing small folders, refreshing completey and not chosing a root directory. In the end I found out that its easier to copy the whole picture and music stuff onto a simple USB drive. Still quite annoying that D-link does not provide what they advertise.
So if anyone knows how the refreshing process with the DIR 685 could be accelerated....