BOOL fBroadcast = TRUE; int err = setsockopt(*lpSock, SOL_SOCKET, SO_BROADCAST, (CHAR *)&fBroadcast , sizeof(BOOL) ); sock.sin_family = PF_INET; sock.sin_addr.s_addr = htonl(INADDR_ANY); sock.sin_port = htons((u_short)wHostPort); if (bind(*lpSock,(LPSOCKADDR)&sock,sizeof(sock)) != SOCKET_ERROR) nRet = ENOERROR; You don't normally need to send from a specific port (although this isn't always true) - here's an example of how it is done. wHostPort is the port number that would be used to send from (source port).

Oh!, thank you for your answer, I tried before the same connection string with no positive results :confused: , but I found the solution :), it was not big deal, it was nothing in the code, it was a problem with permissions in the IIS Configuration :wtf: (Not using Anonymous Access [chosen by default when you create a virtual directory], the correct one was using the Integrated Windows Authentication.). I lost a complete day in a such thing :(( but it happens :sigh: . Anyway, Thx for your help, Vertigo