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From "Richard Mundell" <>
Subject [REPOST] Tomcat 5.5.15 - HTTPS hanging and intermittent "Page Cannot be Displayed" problems
Date Mon, 03 Apr 2006 16:58:29 GMT
Apologies for the repost but I sent this last week but didn't get any
replies. In the hope that the people with the answers on this might've
missed it, I'm trying again... ;-)


From: Richard Mundell [] 
Sent: Friday, March 31, 2006 11:33 AM
To: ''
Subject: Tomcat 5.5.15 - HTTPS hanging and intermittent "Page Cannot be
Displayed" problems

We upgraded our internet-facing web server from Tomcat 5.5.9 to 5.5.15 this
weekend and have run into a number of intermittent connectivity problems
which have resulted in rolling back to 5.5.9.
We use the Tomcat HTTPS connector (without an intermediate web server
between the clients and Tomcat) with all of the default configuration.
Issue 1: A couple of our clients have experienced intermittent connectivity
problems (where approximately 1 out of every 20 page loads results in an
immediate "Page Cannot Be Displayed" error in Internet Explorer - it appears
that Tomcat immediately rejects the connection).
Issue 2: Also, during peak loading (although we're only talking about 30 to
40 concurrent users here) Tomcat appears to hang for a while and make new
connections wait for up to 1 minute before returning a page. 
Throughout this time processor load has been consistently < 20%. (The server
is a dual Xeon processor, dual core machine, running Windows 2003 Server).
The first problem we've seen before when we used to use Apache (with the JK
connector) to deliver the HTTPS pages - I suspect the compatibility with
Apache/OpenSSL's implementation of SSL and Internet Explorer's
implementation of SSL are still slightly incompatible. (I believe this is a
known issue on a Windows platform but has never been resolved). The second
problem (with Tomcat not responding to new HTTPS requests quickly under
moderate load) is new on me.
I'm not really able to submit this as a bug to the Tomcat team as
out-of-hours we've been unable to recreate this (even simulating a high load
using JMeter), and the "Page Cannot Be Displayed" issue only occurs with
certain brands of proxy server (Secure Computing's Sidewinder seems
particuiarly sensitive to this). Also, there's no errors   
The only conclusion I can draw right now is that if you want to use Tomcat
to deliver HTTPS content from a Windows-based server, stick with Tomcat
Has anyone else had a similar experience?
Richard Mundell
The Roberts Group
Market Data Expertise that FITS.
+1 212 499 2680 x20 (office)

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