Radius Access PB

Hi I have freeradius launched and working great on my server, for ADSL authentication, with one NAS, but I am trying to use the same radius with another RAS configured on another DSP, I'm getting always this message: RADIUS, Accounting Request With no reply from my server, even though, in the same time, everything is working great with the other DSP, and if I make radtest locally, I can get on my radius (using radiusd -x) the access request and the reply. I tried to do the same configuration with the other DSP, ignoring the postgresql Flags, and still getting the request but no reply from my side. Any idea?? Thanks Best regards, Elie Hani