Request timed out waiting for an available thread to run. CFMX 6.1

[hotani]

We are getting this error on an internal database server running
RedHat, MySQL 4.1.11 and ColdFusion 6.1.

This server gets hit pretty hard at about 4pm, at which time it grinds
to a screeching halt, filling the cf logfile with the following:

------------------
java.lang.RuntimeException: Request timed out waiting for an available
thread to run. You may want to consider increasing the number of active
threads in the thread pool.
at
jrunx.scheduler.ThreadPool$Throttle.enter(ThreadPo ol.java:125)
at
jrunx.scheduler.ThreadPool$ThreadThrottle.invokeRu nnable(ThreadPool.java:448)
at
jrunx.scheduler.ThreadPool$UpstreamMetrics.invokeR unnable(ThreadPool.java:294)
at jrunx.scheduler.WorkerThread.run(WorkerThread.java :66)
------------------

Users will eventually see a JRun error - server unavailable - all kinds
of nastiness.

I have scoured the intertubes for answers, and before anyone posts it,
yes I have been here:
[url]http://www.adobe.com/go/tn_19351[/url]

Using that page as a guide, the xml files were updated but we are still
experiencing the same problem. Many other pages exist, but they all
post the same fix: update the xml files with new threadWaitTimeout
values. This is what we have right now:

--------------------
<service class="jrun.servlet.jrpp.JRunProxyService"
name="ProxyService">
<attribute name="activeHandlerThreads">64</attribute>
<attribute name="minHandlerThreads">1</attribute>
<attribute name="maxHandlerThreads">1000</attribute>
<attribute name="mapCheck">0</attribute>
<attribute name="threadWaitTimeout">20</attribute>
<attribute name="backlog">500</attribute>
<attribute name="deactivated">false</attribute>
<attribute name="interface">*</attribute>
<attribute name="port">51010</attribute>
<attribute name="timeout">300</attribute>
-------------------
and
-------------------
<service class="jrun.servlet.http.WebService" name="WebService">
<attribute name="port">8500</attribute>
<attribute name="interface">*</attribute>
<attribute name="deactivated">true</attribute>
<attribute name="activeHandlerThreads">64</attribute>
<attribute name="minHandlerThreads">1</attribute>
<attribute name="maxHandlerThreads">1000</attribute>
<attribute name="mapCheck">0</attribute>
<attribute name="threadWaitTimeout">150</attribute>
<attribute name="backlog">500</attribute>
<attribute name="timeout">300</attribute>
</service>
---------------------

Suggestions?

[hotani]

I just made a change in cfadmin that might have an effect: the "Timeout
Requests..." setting was not checked, so I checked that and set it to
150. Not sure if it will do any good or not.