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Date: Wed, 03 Mar 2004 13:13:17 +0700
From: Eugene Grosbein <eugen@kuzbass.ru>
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To: Don Lewis <truckman@FreeBSD.org>
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cc: net@FreeBSD.org
Subject: Re: Frozen connections
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Don Lewis wrote:

> > ---------------------------------------------------------------------------
> > Packet 90
> > TIME:   12:06:51.278337 (0.279509)
> > LINK:   00:90:27:AB:08:88 -> 00:90:27:35:05:1B type=IP
> >   IP:   www -> kost hlen=20 TOS=00 dgramlen=41 id=64CE
> >         MF/DF=0/1 frag=0 TTL=64 proto=TCP cksum=A7ED
> >  TCP:   port http -> 2134 seq=1179931920 ack=1524903532
> >         hlen=20 (data=1) UAPRSF=010000 wnd=58400 cksum=FC43 urg=0
> > DATA:   t
> > ---------------------------------------------------------------------------
> > Packet 91
> > TIME:   12:06:51.278615 (0.000278)
> > LINK:   00:90:27:35:05:1B -> 00:90:27:AB:08:88 type=IP
> >   IP:   kost -> www hlen=20 TOS=00 dgramlen=40 id=10E6
> >         MF/DF=0/1 frag=0 TTL=128 proto=TCP cksum=BBD6
> >  TCP:   port 2134 -> http seq=1524903532 ack=1179931920
> >         hlen=20 (data=0) UAPRSF=010000 wnd=0 cksum=5466 urg=0
> > DATA:   <No data>
> >
> > As you see, last pair of packets repeats many times
> > and transfer is stalled here. What's wrong and who is guilty?
> 
> It looks like the client is the guilty party.  The server is sending
> 1-byte long window probes, and the client is responding with an ACK
> packet that is advertising a receive window of 0.
> 
> I'd be suspicious of the application software on the client.  Can you
> try a different web browser, or even fetch the same URL using something
> like telnet?

I've tried using Netscape Communicator 4.8 and MSIE 6.0
The picture is the same.

Eugene Grosbein