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James,

On 11/17/16 11:54 AM, James H. H. Lampert wrote:
> Ladies and Gentlemen:
> 
> Got a customer box, Tomcat 7.0.47 running on an AS/400, and I'm
> getting a lot of
>> Nov 17, 2016 3:39:44 AM org.apache.coyote.ajp.AjpMessage
>> processHeader SEVERE: Invalid message received with signature
>> 18245
> 
> with occasional
>> Nov 17, 2016 3:41:06 AM org.apache.coyote.ajp.AjpMessage
>> processHeader SEVERE: Invalid message received with signature
>> 18501
> mixed in.
> 
> They're coming in clusters, about 3-4 within a minute or two,
> separated by anywhere from a few minutes to a few hours.
> 
> I'm also seeing occasional clusters of
>> java.io.IOException: The requested resource is busy.
> 
> The only contexts running are two instances of our own CRM
> front-end, along with manager and host-manager.
> 
> I've never seen this before, and a Google search on the message
> seems to mainly return answers for a different Apache product.
> 
> Can anybody tell me what it is I'm looking at?

Presumably, you have httpd out in front of your Tomcat instances?

Please check to see that these two configuration settings match each
other:

httpd/mod_jk:
worker.name.max_packet_size=[some value]

(or for mod_proxy_ajp:
   ProxyIOBufferSize  [some value]
)

Tomcat:
<Connector protocol="[AJP]"
   packetSize="[some value]"

If those don't match, you can have httpd sending packets that are too
long for Tomcat and confusion arises.

- -chris
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