multiple concurrent socket connections

[printf]

i've found quite a bit of articles on sockets, particularly on msdn, but one thing i haven't been able to ascertain, is how multiple concurrent connections are implemented on the server.

i've set up my own one-to-one client/server socket implementation and it works. however, if i close the client application, restart it and attempt to connect, the accept function fails with a WSAEINVAL error. According to msdn, WSAEINVAL - means the listen function was not invoked prior to accept.

this is not true though - the listen function was invoked prior to accept, which is how the first connection attempt was successfull.

any high-level thoughts as to why i might be having this problem? if needs be, i'll post some code, but i don't think it's much different that any other socket code out there..

[Atheist]

Actually, it'd be good if you could show us the server and client code.

[printf]

alright, i stripped this down to the bare essentials, to make getting this up and running as easy as possible if you want to try it out:

SOCKET socketx;
#define WM_SOCKET WM_USER+10
long CALLBACK WndProc(HWND hwnd,UINT msg,WPARAM wParam,LPARAM lParam){
	switch(msg){	
		case WM_CREATE:{				
				SetWindowPos(hwnd,HWND_TOPMOST,0,0,0,0,SWP_NOMOVE | SWP_NOSIZE);

				WSADATA wsaData;	
				WSAStartup(MAKEWORD(1,1), &wsaData);

				socketx = socket(AF_INET,SOCK_STREAM,0);				
				WSAAsyncSelect(socketx,hwnd,WM_SOCKET,FD_CONNECT|FD_READ|FD_CLOSE|FD_ACCEPT);

				unsigned short port = 7;
				struct sockaddr_in addy;
  				addy.sin_family = AF_INET;
				addy.sin_port = htons(port);
				addy.sin_addr.s_addr = INADDR_ANY;
   				bind(socketx,(struct sockaddr*)&addy,sizeof(addy));
				listen(socketx,SOMAXCONN);				
			}
			break;		
		case WM_SOCKET:{
			switch(LOWORD(lParam)){
				case FD_ACCEPT:  {
					struct sockaddr cli_addr;
					int clilen = sizeof(cli_addr);
					socketx = accept(socketx,(struct sockaddr*)&cli_addr,&clilen);
					if(socketx==INVALID_SOCKET){
						MessageBox(NULL,"Invalid Socket","",MB_OK);
					}
				}
				break;
				case FD_READ:{ 					
					char data[1024];
					recv(socketx,data,1024,0);

					send(socketx,"server: hello",strlen("server: hello"),0);
				}
				break;
			}
			}
			break;
		case WM_DESTROY: 
			PostQuitMessage(0); 
			break;	
 		default: 
			return DefWindowProc(hwnd,msg,wParam,lParam);
	}
}

obviously, this is a win32 app and i'm using the wMsg param in WSAAsyncSelect to pump socket message through my callback proc.

to repro the error, connect to this app, note the "server: hello" response, close the client app, then restart it and accept will fail as mentioned in my previous post.