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The following code has been running for several years without problems on 32 bit systems. We are now attempting to build the code for a 64 bit Windows 7 system. The select statement is returning a 10038 error. The socket was ok in the "bind" and "listen" function calls. Perhaps the structure being built by FD_SET is aligned improperly? Any ideas? int rc = 0, temprc = 0; SOCKET AcceptSocket = 0, objListenSocket = 0; struct sockaddr_in socketinfo, acceptinfo; int iLength; struct timeval stTimeout; fd_set structReadFDS; char cLogBuffer[150]; // Create the listening socket objListenSocket = socket (AF_INET, SOCK_STREAM, 0); if (objListenSocket == INVALID_SOCKET) { rc = XSRV_COULDNT_CREATE_SOCKET; temprc = WSAGetLastError(); goto exit1; } // Bind the socket // Port number must be in Network byte order (big endian) memset (&socketinfo, '\0', sizeof(socketinfo)); socketinfo.sin_family = AF_INET; socketinfo.sin_port = htons(47809); socketinfo.sin_addr.s_addr = INADDR_ANY; rc = bind(objListenSocket, (struct sockaddr *)&socketinfo, sizeof(socketinfo)); if (rc == SOCKET_ERROR) { temprc = WSAGetLastError(); rc = XSRV_COULDNT_BIND_SOCKET; goto exit1; } // Listen on the socket for a connection, backlog = 5 deep (the max) rc = listen(objListenSocket, SOMAXCONN); if (rc == SOCKET_ERROR) { temprc = WSAGetLastError(); rc = XSRV_COULDNT_LISTEN_ON_SOCKET; goto exit1; } // Use select to determine if there is any data on the listening // socket. If not, don't try to accept. This keeps the accept from // blocking. // Initialize the select structure with listening socket. FD_ZERO(&structReadFDS); FD_SET(objListenSocket, &structReadFDS); // Select timesout in 1/2 a second temprc = select(NULL, &structReadFDS, NULL, NULL, &stTimeout); // If error if (temprc == SOCKET_ERROR) { temprc = WSAGetLastError(); rc = XSRV_COULDNT_SELECT; goto exit2; }