> > Plan 9 ignores the zero length window and sends a single byte (2456ms),
> > causing godaddy to hang up (2493ms).
> 
> it is probing the zero window (rfc793, section 3.7)

for those, like me, who have not committed 793 to memory:

        "When the receiving TCP has a zero window and a segment arrives it must
        still send n acknowledgment show its next expected sequence number 
        and current window (zero).

p. 41 near the bottom.  looks like godaddy's tcp has the bug.

- erik

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