1. Operating System Information: Operating System: Windows 7 Professional CPUIntelR CeleronRCPU 430@ 1.80GHz RAM1.00GB System Type: 32-bit OS 2. Win7 Computer adapter card: Realtek RTL8168B/8111B serias PCI-E KM ethernet NIC (NDIS 6.20) 3. Issue description: FTPClient HTTP Proxy Server FTP Server |_______Loopback_________| |_____WAN 300ms Delay_______| As shown above, FTP Client and HTTP Proxy Server are on a same computer with Windows 7 OS. Between HTTP Proxy Server and FTP Server are a wide area network with a delay of 300ms. The FTP Client can send data at a speed of 1 to 16 MBps, while the FTP Server can only receive data at a speed of 50 to 200 KBps. At the HTTP Proxy Server end, it receives data fast from FTP Client (1-16 MBps) and sends data fast to FTP Server (1-16MBps). The FTP Client finishes sending very soon. It then sends FIN packet to close the connection; however, it does not receive the FIN ACK from the server for a long time. When this happens, we find that the FTP Server is still receiving data. When we observe the FTP Client, we find Windows 7 system memory usage is up to 95%, while the programs on application layer do not occuy much memory. To be specially noted, this issue occurs only when the configuration is Windows 7 + KM ethernet. Could you kindly help us to clarify the following two questions: 1. Does Windows 7 has the cache feature? If yes, is there any method to disable it? If no, could you help us to find out what is the other reason? 2. Could you kindly give us some other suggestions to help us to solve the issue that the HTTP proxy does not work correctly due to operating system cache?

Please help!

Hi, As I know Windows 7 hasn’t this cache feature. Just for a check, please connect the FTPClient directly to the FTPServer and see how it works. Thanks.Nicholas Li - MSFT