wifi file transfer problems

Hello, i have a wifi router managed as bridge. I have two notebooks connected to that wifi but they can't send files to each other, but when i connect one of them through LAN magic happens. Computers are in same local network and they getting ip from dhcp on same network. I've disable the firewall on both computers but they can't still make file transfer when both of them are on wifi connection. The problem is in bridged wifi router or somewhere else? Thanks