Thanks vitamin for reply. I changed in /etc/hosts the 2nd line to Code: 192.168.2.108 fusion but the same as before, even the debug output of wine. I checked also the debug output of an working udp programm. The output looks similar, but i see different socket numbers, pointer adresses. I don't know where this parameters came from, this maybe helps to find a solution. Code: trace:winsock:WS_bind socket 0060, ptr 0x32e910 { family AF_INET, address 0.0.0.0, port 9871 }, length 16 trace:winsock:_remap_optname level=65535, optname=32 trace:winsock:WS_setsockopt socket: 0060, level 0xffff, name 0x20, ptr 0x32e968, len 4 trace:winsock:WSAAsyncSelect 60, hWnd 0x100a6, uMsg 00000d10, event 0000003f trace:winsock:WS_gethostbyname "fusion" ret 0x17dd98 trace:winsock:WS_getsockname socket: 0060, ptr 0x32ea28, len 10 trace:winsock:WS2_sendto socket 0060, wsabuf 0x32e818, nbufs 1, flags 0, to 0x32e884, tolen 16, ovl (nil), func (nil) trace:winsock:WS2_sendto fd=18, options=0 I should spend more time with the wine manual. Lets see how many time i will have in the comming week. Thanks for your time Olli