Ajp invalid message received with signature

Yasser picture Yasser · Aug 6, 2012 · Viewed 69.8k times · Source

I am using Tomcat 7.0.29 fronted with Apache 2.2.22 modproxy. Configured Ajp as the protocol in httpd.conf and AjpNioProtocol in server.xml. After the server starts, the logs are filled with the following message:

Severe: Invalid message received with signature 20599
com.apache.coyote.ajp.AjpMessage processHeader

There are no requests sent to the web or tomcat server and it still throws that error. Access logs in tomcat and apache show that no request is coming in. What is causing the invalid message error?

Here is the configuration :

  • httpd.conf

    ProxyPass /wl ajp:// ip : port /wl
    ProxyPassReverse /wl ajp:// ip : port /wl
    
  • server.xml

    <Connector port="port" 
               protocol="org.apache.coyote.ajp.AjpNioProtocol" 
               connectionTimeout="20000" 
               acceptorThreadCount="2" 
               maxThreads="1600" 
               redirectPort="8443" />
    

Answer

smntx picture smntx · Feb 27, 2015

For me, the problem was simple. I was sending HTTP requests but the connector was configured with AJP protocol. My connector in server.xml was configured like this:

<Connector port="8009" protocol="AJP/1.3" redirectPort="8443"/>

But when I changed it to this:

<Connector port="8009" protocol="HTTP/1.1" redirectPort="8443"/>

The error went away.

Hopefully that will help someone with this error.