socket 中recv只能接收一次，下次就不能接收数据了，百思不得其解。

函数如下：

DWORD HandleWebRequest()
{
SOCKET sLiten,client;
struct sockaddr_in tcpaddr,from;
int fromlen,port=6000 ;
int pktlen;
u_long flags=1;
char Buffer[1024];

fromlen = sizeof(from);

char* HttpHead=" Pass customer's Request";
int HttpHeadlength=strlen(HttpHead);
char* HttpData="this is data,Begin transfer";
int HttpDatalength=strlen(HttpData);
sLiten=socket(AF_INET,SOCK_STREAM,IPPROTO_TCP);

if (sLiten == INVALID_SOCKET)
goto ErrorExit;
///////////////////////////////
tcpaddr.sin_family=AF_INET;
tcpaddr.sin_addr.s_addr =INADDR_ANY;
tcpaddr.sin_port=htons(port);
if (bind(sLiten,(struct sockaddr*)&tcpaddr,sizeof(tcpaddr))==SOCKET_ERROR)
goto ErrorExit;

if (listen(sLiten,6) == SOCKET_ERROR)
goto ErrorExit;

while(1)
{
client = accept(sLiten, (struct sockaddr *)&from,&fromlen);
if(client==INVALID_SOCKET)
goto ErrorExit;
memset(Buffer,0,sizeof(Buffer));
if ((pktlen = recv(client,Buffer,1024,0))<=0) //第一次能成功，第二次就失败了。
{
int errorNo=WSAGetLastError(); // errorNo=10054.
closesocket(client);
break;
}
if(strlen(Buffer)>0)
{
if(strstr(Buffer,"Request data")!=NULL)
{
send(client,HttpHead,HttpHeadlength,0);
closesocket(client);
}
else if(strstr(Buffer,"Transfer Data")!=NULL)
{
send(client,HttpData,HttpDatalength,0);
closesocket(client);
}
}
}
closesocket(sLiten);
ErrorExit:
{
fprintf(stderr,"failed with error %d\n",WSAGetLastError());
return -1;
}
return 0L;
}


错在什么地方了？