Hi Ronald,
I think we do have such a firewall. I will find out
the exact configuration and get back to you.
Tim
----- Original Message -----
From: "Ronald Klop" <[EMAIL PROTECTED]>
To: "Tomcat Users List" <users@tomcat.apache.org>
Cc: "Tim Lavers" <[EMAIL PROTECTED]>
Sent: Tuesday, April 15, 2008 8:58 PM
Subject: Re: Delay between TCP handshake and POST (complete)
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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