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From Ronald Klop <>
Subject Re: Delay between TCP handshake and POST (complete)
Date Tue, 15 Apr 2008 06:35:00 GMT
Reverse DNS lookup which always fails?


On Mon Apr 14 23:46:23 CEST 2008 Tomcat Users List <> wrote:
> Am running a Tomcat 6.0 server that is distributing a client program using 
> Java WebStart. The client program communicates to the server using 
> an RMI HTTP tunnelling servlet which is running inside the same Tomcat 
> instance. I've had this setup running on three different computers.
> On two of them, the performance is pretty good. On our production
> system, however, the performance is terrible.
> The download of the application is ok, what is bad is a strange pause
> in the tunnelling. Using wireshark, I can see that after the WebStart
> system has downloaded all of the software, the tunnelling operation
> initiates a TCP connection with the three-way handshake but then there
> is a 4.5 second delay before the expected POST operation.
> The differences between the slow system and the two fast systems are:
> 1. The slow one has two network cards
> 2. The slow one is not a Domain Controller, its domain controller
> is a Thinpoint Linux machine.
> The delay is always very close to 4.5 seconds, so perhaps it is a timeout.
> Anyhow, any advice on how to further diagnose the problem would be
> much appreciated.
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