Connection issues from Tomcat server

I have two users, separated by about 3 miles. Both are using cable modems from the same provider. Both are using WinXP. Both are running the same application from a central tomcat server.

User 1 gets dialog x from the server in ~2 seconds. All transactions are successful (the dialog is used to make some selections).
User 2 gets the same dialog in ~10 seconds. Approximately 1 in 3 transactions doesn't register with the server ( seems to have something to do with the size of the transaction).

Otherwise the speed of both connections seems to be the same.

How do I debug this? I have lots of debug code on the server side to monitor the transactions. When user 2 has a 'failed' transaction nothing happens on the server side. No output, no exceptions, nothing. The dialog believes that the data was properly submitted.
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check the MTU settings on both machines, may have to adjust one the one that is giving the problems also the see these other reg entries;en-us;158474
ethrbunnyAuthor Commented:
Any idea which one(s) would be applicable?
DefaultRcvWindow = 16-bit number

Data Type: DWORD
For Windows 98, the Data Type is a String value.

Specifies the default receive window advertised by TCP. The default is 8192
and the maxMTU as I stated above
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ethrbunnyAuthor Commented:
Could these settings effect 'post' requests from a client?
they affect general tcp requests/recieves

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ethrbunnyAuthor Commented:
Ill give the points to StevenLewis for helping. I tried a number of different registry changes to no avail. Not sure what the problem is.
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