proxy:ajp 'client denied by server configuration' when too many simultaneous requests happen

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httpd error log:
client denied by server configuration:
proxy:ajp://localhost:8009/geoserver/gwc/service/wms

This happens under 'high' load only (pages usually display
fine...there's no specific bad URL here).

httpd snippet:
ProxyPreserveHost on
RewriteRule ^/geoserver/(.*)$ ajp://localhost:8009/geoserver/$1 [P]
ProxyPassReverse /geoserver ajp://localhost:8009/geoserver/

<LocationMatch "^(/[\w_]*/geoserver/.*)">
    Order Allow,Deny
    Allow from all
  </LocationMatch>

I have tried this without any apparent difference:
<Proxy ajp://localhost:8009>
    ProxySet keepalive=On timeout=15 ttl=60
</Proxy>

Happens even with 'Allow from all' in proxy.conf (in fact nothing in
that file makes any difference, presumably as it only affects Forward
proxies.

Back-end is GeoServer in Tomcat 6 (exactly same thing happened with
5.5) on Debian Squeeze 64-bit & current Sun JVM.
Nothing in the logs at the back-end, though, seems to be a problem
with the Connector.
Same thing whether or not using the 'APR based Apache Tomcat Native
library 1.1.20' or not.
I tried putting in a connectionTimeout into server.xml, but it makes
no difference:
<Connector port="8009" protocol="AJP/1.3" redirectPort="8443"
connectionTimeout="60000" />

Only web posts I've seen are the on/off conditions rather than erratic ones.

Many thanks, for any suggestions :)

Fran.

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