Re: LWP slow downloads on windows

This may be a TCP issue. This issue manifests itself on high-bandwidth + high latency links.

The Microsoft KB article # 224829 incorrectly states that "Timestamps and Window scaling are enabled by default..".

What actually happens is that when a Windows machine initiates a TCP connection, it does NOT advertise "Window scaling" by default.

This must be manually enabled by setting a registry entry, then rebooting:

(Save these lines to a file - suggested name: TCPIP-RFC1323.reg. This will allow error-free, consistent update of several machines)

    Windows Registry Editor Version 5.00

    [HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parame
+ters]
    "Tcp1323Opts"=dword:00000003
[download]

This requires a reboot, in order to take effect.

Please refer to Microsoft KB 224829 for an explanation of this entry, as well as information on TCP Window Scaling.

Have you been high today? I see the nuns are gay! My brother yelled to me...I love you inside Ed - Benny Lava, by Buffalax

Comment on Re: LWP slow downloads on windows Download Code

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Re^2: LWP slow downloads on windows by robobunny (Friar) on Dec 03, 2008 at 21:02 UTC
Thanks for the info. That doesn't seem to be the problem. I added the registry key and rebooted, and I'm getting about the same download time.	[reply]