Hi,
I am using two tomcat 6.0.13 servers loadblanced by a apache httpd-2.2.4
to host the web application (SOAP service). This application do get
about 30k hits per day. Almost all requests are processed successfully
except for few which returns 404 errors from the httpd server to client.
These 404 errors are not due to incorrect url. I have captured tcp
traces and analyzed. As per my analysis I can see tomcat reset the
connection and send RST and there after httpd send 404 error back to
client. I cannot find any problem in application logs or catalina.log.
So I am suspecting this could be a problem related to Tomcat and ajp.
Following is the last 3 lines of the TCP trace where httpd ip
10.255.20.11 and tomcat ip 10.255.20.107. For a successful
request/response, usually Tomcat send FIN and close the connection
correctly.
1. 10.255.20.11 -> 10.255.20.107 TCP 34071 > 8503 [PSH, ACK]
Seq=13141 Ack=4769 Len=663
2. 10.255.20.107 -> 10.255.20.11 TCP 8503 > 34071 [Ack]
Seq=4769 Ack=13804 Len=0
3. 10.255.20.107 -> 10.255.20.11 TCP 8503 > 34071 [RST, Ack]
Seq=4769 Ack=13804 Len=0
Tomcat server suppose to send a response to the request received in
packet 1 (PSH) but before sending it reset the connection.
Following error is also present in the httpd error log relevant for the
above problem
[error] ajp_read_header: ajp_ilink_receive failed
[error] (120006)APR does not understand this error code: proxy: read
response failed from 10.255.20.107:8503
I searched the tomcat change log but could not find any bug fixes
related to this as per my knowledge. So I wonder any one in this forum
has ever come across a similar issue and have a reason /resolution for
the problem.
Many thanks.
Regards,
Chaminda
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