This is OT because none of the participating equipment runs Linux, but I
figured it was worth asking anyway since some of you are network geeks.

I have an application called ProLaw that runs off a NetWare server on the
other side of a PIX firewall. (The client is inside, the server is outside.)

Most of my Win2K workstations perform fine. But two or three of them slow
way down after a few hours of use, to the point that queries that normally
take 10-15 seconds take 1.5 minutes! Meanwhile, other clients on the same
switch keep working fine.

Ethereal traces show that during the slow periods, the client retransmits a
lot of ACKs of the same data. It will transmit the same ACK maybe 9 or 10
times in a row with only about 0.000002 seconds between. Then the server
finally retransmits a packet of its own. 

Finally, the client ACKs all of the previously received data at once and
catches up (about half of its window size). It does this over and over
again, slowing down the overall communication. 

Can somebody please offer some insight on what could be happening here?

--Eric


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