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From Ronald Klop <ronald-mailingl...@base.nl>
Subject Re: Delay between TCP handshake and POST (complete)
Date Tue, 15 Apr 2008 10:58:26 GMT
Do you have a firewall which does DNS lookups?

Ronald.

On Tue Apr 15 08:58:18 CEST 2008 Tomcat Users List <users@tomcat.apache.org> wrote:
> Thanks Ronald,
> 
> I've got enableLookups="false" in the server.xml file
> and Wireshark shows no signs of DNS lookups.
> Also, all of the Webstart stuff (downloading jars etc)
> is pretty responsive.
> 
> So I don't think that is the problem ... but is there any way
> that Tomcat would do reverse DNS lookups if
> I've got enableLookups=false"?
> 
> Tim
> 
> > Reverse DNS lookup which always fails?
> >
> > Ronald.
> >
> > On Mon Apr 14 23:46:23 CEST 2008 Tomcat Users List 
> > <users@tomcat.apache.org> 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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> >
> > 
> 
> 
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