first of all thanks for this great program

i have the following configuration :
raspberry b+ under raspbian with hostapd(using dnsmasq) and a tp-link usb wifi
i configured it and everything is perfectly working(live view, triggering etc) except the downloading files part, i keep having this message on ddserver : Error sending packet to client
and before this one : Error reading total packet size: -1
I have to admit i'm a little lost as it was working quite good through the eth0 connection over a router
Any clue ?
thanks