networkingtcpwindowswindows-registry
Is there any possibility to change default wait for ACK timeout in TCP network on Windows 7 or Windows Server ?
I'm using very slow network ( 1200 bps ) and want to tweak TCP. When using default parameters network stuck on multiple retransmissions . If I'm able to change the ACK timeout and tx window size I think that it would work.
On Windows XP it was possible but cant find any document for Win7 and Win Server.
Window size at zero means the OS has received all the data it can in its receive buffer for this connection and is waiting for the application to read() it. In other words, if you don't read the data the server is sending you, as fast as it's sending it, at some point it will block like this. How are you using wget, can you paste the exact script/command? Same with your java program, are you sure it's reading all the data from the server, and never getting backed up, or missing an event/notification that data is ready, or having a problem where it can't keep up with its read()s?
Also, check netstat -anp and look at the Recv-Q column for this connection, if it's not 0 then there's data buffered up, waiting for your app to read it. Edit: argh, Windows, this link might help.
Best Answer
Couple of links that may be helpful in your situation:
http://www.experts-exchange.com/OS/Microsoft_Operating_Systems/Q_28353794.html
http://support.microsoft.com/kb/170359
This article is actually the opposite problem (he's trying to use a big pipe) but doing the inverse of some of the settings might help: https://www.duckware.com/blog/how-windows-is-killing-internet-download-speeds/index.html