Page leads to proxy error sometimes or taking too much time to load

Question

Hi All,
APEX4.0
Web server: Apache 1.3.9 (Oracle 9iAS 10.0.1.2.2)
I am getting  the below error at first time when I try to open a page or the page takes 3 to 5 mins to load. From second time on wards, It takes 5 to 8 sec to open as normal. I debugged the page and checked the log. Logs and execution time are looking normal.  why the page takes too much time to load at first time or it leads to proxy error?? Is anybody got same experience before??
Proxy Error
The proxy server received an invalid response from an upstream server.
The proxy server could not handle the request GET/pls/apex/f.
Reason : Document contains no data
Please guide me to find out and  resolve this issue....
Thanks in Advance
Lakshmi

Answer 1

Hi this is what the solution given by your link
A.1.6 Connection Timeouts Through a Stateful Firewall Affect System Performance
Problem
To improve performance the mod_oc4j component in each Oracle HTTP Server process maintains open TCP connections to the AJP port within each OC4J instance it sends requests to.
In situations where a firewall exists between OHS and OC4J, packages sent via AJP are rejected if the connections can be idle for periods in excess of the inactivity timeout of stateful firewalls.
However, the AJP socket is not closed; as long as the socket remains open, the worker thread is tied to it and is never returned to the thread pool. OC4J will continue to create more threads, and will eventually exhaust system resources.
Solution
The OHS TCP connection must be kept "alive" to avoid firewall timeout issues. This can be accomplished using a combination of OC4J configuration parameters and Apache runtime properties.
Set the following parameters in the httpd.conf or mod_oc4j.conf configuration files. Note that the value of Oc4jConnTimeout sets the length of inactivity, in seconds, before the session is considered inactive.
Oc4jUserKeepalive on
Oc4jConnTimeout 12000 (or a similar value)
Also set the following AJP property at OC4J startup to enable OC4J to close AJP sockets in the event that a connection between OHS and OC4J is dropped due to a firewall timeout:
ajp.keepalive=true
For example:
java -Dajp.keepalive=true -jar oc4j.jar
Please tell me where or which file i should put the option
java -Dajp.keepalive=true -jar oc4j.jar ??????/