
Microsoft does not guarantee the accuracy of this information. Please Note : Since the web site is not hosted by Microsoft, the link may change without notice. How to Adjust TCP Window Size to Improve Network Performance You can do that by editing the registry key: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\AFD\Parameters\DefaultSendWindow

You ‘ll find places on the Internet telling you to change registry values to increase your window size In all recent Microsoft Windows implementations, windows scaling is enabled by default.

We have been analysing this problem for quiet some time and come to the conclusion that there is an issue with "tcp window scaling" of our window r2 2008 server, our windows 7 clients and windows 2012r2 (latter is a test system in Hongkong). The tunel is stable and the latency is about 180 ms. Through this line we have two firewalls connected via an ipsec vpn tunel. We have rented a high bandwidth low latency line between Zürich (Switzerland) and Hongkong.
