On 2/20/07, Ulf Lamping <[EMAIL PROTECTED]> wrote:

> Interestingly, the effect I saw is that the window size is zero before
> and after the probe byte, although the receiver actually ACK'ed the
> "probe byte".

Do you use window scaling?
If you have window scaling the most likely explanation for your
observation is that the window is not really 0 but smaller than the
scaling factor.

I.e. assume the window is 7 bytes in size  but you have a window scale
factor of 8.
Since 7/8 is 0,  zero is what will be advertized.
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