I also ran into this just today (although I don't get entries in my
logs).  I believe I found a solution.  In workers.properties under the
ajp13 Worker Definition I uncommented the worker.ajp13.cachesize line
and set it equal to the desired max cache size.

For example:
worker.ajp13.cachesize=20

I don't really know the details of how jk works so I don't know what
implications setting this value has.  If there are any, please let me
know.  Hope this helps.

Jeff Spors
Winona State University



-----Original Message-----
From: David [mailto:[EMAIL PROTECTED] 
Sent: Wednesday, August 24, 2005 3:09 PM
To: tomcat-user@jakarta.apache.org
Subject: 10 connection limit with IIS and JK/ISAPI 1.2.14

I'm using Tomcat 5.5.9 on Windows Server 2003, JDK 1.5.0_04, IIS 6.0,
with the JK 1.2.14 isapi_redirector.dll.
 
I've been trying to track down a problem whereby all of the web apps
under our Tomcat instance are seeming to stall. There's no indication of
any problems in the Tomcat logs themselves. I suspect IIS is unable to
forward requests to Tomcat. I either have to recycle the IIS worker
process or restart Tomcat to resolve the problem.
 
Here's what I'm seeing with netstat (port 8008 is my AJP 1.3 port):
 
Z:\>netstat -a -n | grep 8008
  TCP    0.0.0.0:8008           0.0.0.0:0              LISTENING
  TCP    147.92.2.137:2871      147.92.2.137:8008      ESTABLISHED
  TCP    147.92.2.137:2915      147.92.2.137:8008      ESTABLISHED
  TCP    147.92.2.137:2944      147.92.2.137:8008      ESTABLISHED
  TCP    147.92.2.137:2965      147.92.2.137:8008      ESTABLISHED
  TCP    147.92.2.137:2969      147.92.2.137:8008      ESTABLISHED
  TCP    147.92.2.137:3019      147.92.2.137:8008      ESTABLISHED
  TCP    147.92.2.137:3034      147.92.2.137:8008      ESTABLISHED
  TCP    147.92.2.137:3039      147.92.2.137:8008      ESTABLISHED
  TCP    147.92.2.137:3041      147.92.2.137:8008      ESTABLISHED
  TCP    147.92.2.137:3060      147.92.2.137:8008      ESTABLISHED
  TCP    147.92.2.137:8008      147.92.2.137:2871      ESTABLISHED
  TCP    147.92.2.137:8008      147.92.2.137:2915      ESTABLISHED
  TCP    147.92.2.137:8008      147.92.2.137:2944      ESTABLISHED
  TCP    147.92.2.137:8008      147.92.2.137:2965      ESTABLISHED
  TCP    147.92.2.137:8008      147.92.2.137:2969      ESTABLISHED
  TCP    147.92.2.137:8008      147.92.2.137:3019      ESTABLISHED
  TCP    147.92.2.137:8008      147.92.2.137:3034      ESTABLISHED
  TCP    147.92.2.137:8008      147.92.2.137:3039      ESTABLISHED
  TCP    147.92.2.137:8008      147.92.2.137:3041      ESTABLISHED
  TCP    147.92.2.137:8008      147.92.2.137:3060      ESTABLISHED
 
Every time the stall has happened, I have noticed that there are always
exactly ten connetions between IIS and Tomcat (they're on the same
server). Everything works fine until we reach this point.
 
In my JK log, I'm seeing things like this:
 
[Wed Aug 24 14:10:57 2005] [error]
ajp_connection_tcp_get_message::jk_ajp_common.c (961): Can't receive the
response message from tomcat, network problems or tomcat is down
(147.92.2.137:8008), err=-54
[Wed Aug 24 14:10:57 2005] [error] ajp_get_reply::jk_ajp_common.c
(1503): Tomcat is down or refused connection. No response has been sent
to the client (yet)
 
 
My workers.properties looks like this:
 
worker.list=ajp13a
 
worker.ajp13a.port=8008
worker.ajp13a.host=www.bvu.edu
worker.ajp13a.type=ajp13
 
cachesize=20
cache_timeout=600
recycle_timeout=300
 
 
And here's the AJP connection defininition from my server.xml:
 
    <Connector port="8008"
               maxThreads="150" minSpareThreads="25"
maxSpareThreads="75"
               enableLookups="false" redirectPort="443" debug="5"
connectionTimeout="20000"
               protocol="AJP/1.3"/>
 
 
Any idea what might be happening? It sure looks like I'm hitting some
kind of 10 connection limit somewhere, but I can't seem to figure out
where.


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