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Chuck,

On 11/18/16 12:08 PM, Caldarale, Charles R wrote:
>> From: James H. H. Lampert [mailto:jam...@touchtonecorp.com] 
>> Subject: Re: Getting "Invalid message received with signature
>> xxxxx" messages in catalina.out
> 
>> This is interesting: <Connector port="8009" protocol="AJP/1.3"
>> redirectPort="8443" />
> 
>> Isn't 8009 some sort of backchannel control port, perhaps the one
>> used for controlled shutdown of Tomcat?
> 
> No, 8009 is the default port for communication between httpd and
> Tomcat.  8005 is the default shutdown port.
> 
>> It seems to be defined as an AJP port "straight out of the box,"
>> is also so-defined on our own Tomcat server, and is presumably
>> so-defined at all our other customer installations.
> 
> Correct.  If you're not using it, remove (or comment out) the
> declaration.
> 
> 
>> And yet this is the first time I've ever seen these error
>> messages.
> 
> Something with access to your network is probing that port.

+1

And they aren't speaking AJP, which is why you are getting that error.

- -chris
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