Can't connect via wifi, but wifi works

Hello.
I had a jailbroken Kindle Touch with working bearbox/ssh server.
I installed usbnetwork package because i needed rsync and it installed properly, but for some reason i can no longer connect ot kindle via WIFI.
Connecting through usbnet works, wifi form kindle works and i can access inter, I can ping my comptuer from kinde, but I cannot ping Kindle from my computer, nor connect (it timeouts)
iptables allow all connections.
I've run out of ideas, where should I look for the source of this problem?

Any hints welcome,

and by the way: thanks for all the great work on Kindle hacking!

Best regards,

m.