问题自己搞定。 msdn的正解：Symptoms When you attempt to set up TCP connections from ports above 5000, the local computer responds with a WSAENOBUFS (10055) error, which means: An operation on a socket could not be performed because the system lacked sufficient buffer space or because a queue was full. ResolutionThe default maximum number of ephemeral TCP ports for Microsoft Windows NT is 5000. A new parameter has been added to Windows NT 3.51 Service Pack 5 and to Windows NT 4.0 or higher. To increase the maximum number of ephemeral ports you must set the following registry parameter: Start Registry Editor (Regedt32.exe). Locate the following key in the registry: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters On the Edit menu, click Add Value, and then add the following registry value: Value Name: MaxUserPort Data Type: REG_DWORD Value: 65534 <for example> Valid Range: 5000-65534 (decimal) Default: 0x1388 (5000 decimal) Description: This parameter controls the maximum port number used when an application requests any available user port from the system. Normally, ephemeral (that is, short-lived) ports are allocated between the values of 1024 and 5000 inclusive. Quit Registry Editor.
msdn的正解：Symptoms
When you attempt to set up TCP connections from ports above 5000, the local computer responds with a WSAENOBUFS (10055) error, which means: An operation on a socket could not be performed because the system lacked sufficient buffer space or because a queue was full. ResolutionThe default maximum number of ephemeral TCP ports for Microsoft Windows NT is 5000. A new parameter has been added to Windows NT 3.51 Service Pack 5 and to Windows NT 4.0 or higher. To increase the maximum number of ephemeral ports you must set the following registry parameter: Start Registry Editor (Regedt32.exe). Locate the following key in the registry: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters On the Edit menu, click Add Value, and then add the following registry value: Value Name: MaxUserPort Data Type: REG_DWORD Value: 65534 <for example> Valid Range: 5000-65534 (decimal) Default: 0x1388 (5000 decimal) Description: This parameter controls the maximum port number used when an application requests any available user port from the system. Normally, ephemeral (that is, short-lived) ports are allocated between the values of 1024 and 5000 inclusive. Quit Registry Editor.
aP: PChar;//扩大缓冲区
BufSize:= 8*8192; //8k
aP:=@BufSize;
aLen := sizeof(integer);
if setsockopt(ClientSocket.Socket.SocketHandle, SOL_SOCKET,
SO_SNDBUF, aP, aLen) <> SOCKET_ERROR then
MainForm.MemoLog(‘'data sokcet add send buff succ')
else begin
Errcode := WSAGetLastError;
MainForm.MemoLog(data sokcet add send buff fail, handle:'
+ ', ErrCode: ' + inttostr(Errcode));
end; if setsockopt(ClientSocket.Socket.SocketHandle, SOL_SOCKET,
SO_RCVBUF, aP, aLen) <> SOCKET_ERROR then
MainForm.MemoLog(‘'data sokcet add receive buff succ')
else begin
Errcode := WSAGetLastError;
MainForm.MemoLog('data sokcet add receive buff fail, handle:'
+ ', ErrCode: ' + inttostr(Errcode));
end;