Apache 2.2.3 prefork mpm mod_proxy_ajp

Chris Huisman <chris.huisman@xxxxxxxxxxx> · Mon, 19 Mar 2007 09:17:28 -0600

Hello,

I'm having a problem with mod_proxy_ajp, I am receiving the following 

error messages:

[Fri Mar 16 11:37:37 2007] [error] ajp_check_msg_header() got bad 

signature 420

[Fri Mar 16 11:37:37 2007] [error] ajp_ilink_receive() received bad header
[Fri Mar 16 11:37:37 2007] [error] ajp_read_header: ajp_ilink_receive failed

[Fri Mar 16 11:37:37 2007] [error] (120007)APR does not understand this 

error code: proxy: read response failed from url:8009 ( url)

[Fri Mar 16 13:28:45 2007] [error] (70007)The timeout specified has 

expired: ajp_ilink_receive() can't receive header

[Fri Mar 16 13:28:45 2007] [error] ajp_read_header: ajp_ilink_receive 

failed

[Fri Mar 16 13:28:45 2007] [error] (120006)APR does not understand this 

error code: proxy: read response failed from url:8009 (url)

in my apache error log. 

The following are my configuration files:

httpd.conf:

...
Timeout 300

KeepAlive On

MaxKeepAliveRequests 0
KeepAliveTimeout 15

<IfModule prefork.c>
StartServers 8
MinSpareServers 10
MaxSpareServers 25
ServerLimit 256
MaxClients 256
MaxRequestsPerChild 4000
</IfModule>

<VirtualHost url:80>
       ServerAdmin webadmin@xxxxxxx <mailto:webadmin@xxxxxxx>
       DocumentRoot /var/www/html
       ServerName www.url.com <http://www.xxx.com/>

       ServerAlias www.url.ca <http://www.xxx.ca/> www.url.biz 

<http://www.xxx.biz/>  url.com <http://xxx.com/> url.ca <http://xxx.ca/> 

url.biz <http://xxx.biz/>

       ProxyPreserveHost On
       ProxyRequests Off

       Redirect 301 /cgi-bin/edd.cgi 

http://www.url.com/order/product.html 

<http://www.xxx.com/order/product.html>

       Redirect 301 /cgi-bin/menu.cgi 

http://www.url.com/order/product.html 

<http://www.xxx.com/order/product.html>

</VirtualHost>

In my tomcat server.xml, I have:

   <!-- Define an AJP 1.3 Connector on port 8009 -->
   <Connector address="url"
              port="8009"
              enableLookups="false"
              protocol="AJP/1.3"
              minSpareThreads="20"
              maxSpareThreads="200"
              maxThreads="1024"
              connectionTimeout="600000"
    />

and my proxy_ajp.conf:

ProxyPass /order ajp://url:8009/order
ProxyPass /dwr ajp://url:8009/dwr

The error messages come up intermittently maybe 5 times a day (although 

the ajp_check_msg_header() is a new one).  I believe what happens is the 

user gets to the secure checkout page, hits the order button and then 

the error shows up in the log file, but what the user gets is a blank 

page instead of the order confirmation page.  Could this be an SSL thing?

I've been through the mailing lists and seen some advice for people who 

are using the worker mpm, but nothing when using prefork.

Can anyone please, let me know what is going on (I'd like to understand 

why I get the error messages) and what to do prevent the error from 

coming up.

Thanks all for your consideration it is appreciated,

Chris.

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