Thanks, Jon.
I did in fact compare all the settings between the servers, including the 
logging settings. They are exactly the same. 

But there is new information. In a detailed comparison of the Java code between 
the servers, I spotted one difference. Something sets apart the instance that 
is logging the Warning "AJP13 protocol: Reuse is set to false". The instance 
includes a REST API. As Sherlock Holmes said, "When you have eliminated all 
which is impossible, then whatever remains, however improbable, must be the 

I am now looking into how the combination REST - Tomcat - IIS can trigger the 



-----Oorspronkelijk bericht-----
Verzonden: 11 June 2020 23:57
Onderwerp: RE: Warning "AJP13 protocol: Reuse is set to false" written logs 
every second of every day. Please help.

Perhaps also compare your logging sensitivity between the servers.

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-----Original Message-----
From: Christopher Schultz <>
Sent: Thursday, June 11, 2020 12:55 PM
Subject: Re: Warning "AJP13 protocol: Reuse is set to false" written logs every 
second of every day. Please help.

Hash: SHA256


On 6/11/20 11:57, Alfred Bakia wrote:
> Hi Everyone,
> This is my very first mail to the users list since joining yesterday. 
> Not an auspicious start. But I hope I will be able to contribute in 
> future. I seek your help for a persistent issue in one of our 
> ColdFusion instances.
> Description of issue: ColdFusion 2018 is an application server that 
> uses Tomcat 9.0.21. Our ColdFusion installation consists of instances.
> The instances are independent application servers, each with its own 
> Tomcat installation and Java Virtual Machine. The Java version is 
> 11.0.7.
> Each ColdFusion instance serves web content via the web server IIS.
> We have configured an AJP connector for the communication between 
> Tomcat and IIS. The relevant settings are
> *   In server.xml
> <Connector port="8012" connectionTimeout="60000"
> redirectPort="8445" protocol="AJP/1.3" tomcatAuthentication="false"
> maxThreads="500" packetSize="65535"/>
> *   In
> iis_buffer_enable= true
> *   In
> worker.list=sr1studierdr1
> worker.sr1studierdr1.type=ajp13
> worker.sr1studierdr1.port=8012
> worker.sr1studierdr1.connection_pool_size=800
> worker.sr1studierdr1.connection_pool_timeout=60
> worker.sr1studierdr1.max_reuse_connections=400''
> On one of the instances (name: 'sr1studierdr1'), the following WARNING 
> is written to isapi_redirect.log every second or so:
> *   [Thu Jun 11 16:44:57.739 2020] [11308:15392] [warn]
> ajp_process_callback::jk_ajp_common.c (2242): (sr1studierdr1) AJP13
> protocol: Reuse is set to false
> Nevertheless, the application seems to work as intended.
> We're at a loss why this is happening only to this particular 
> instance. There are no such warnings in other instances that share 
> exactly the same settings.
> Do you know what is causing the warning, "AJP13 protocol: Reuse is set 
> to false", or how to solve this?

I have no idea, but Google seemed able to come up with this:

Does that help at all?

Apache httpd configuration of mod_jk has a DisableReuse flag that can be set, 
but I don't see such a thing for IIS.

- -chris
Comment: Using GnuPG with Thunderbird -


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