No response message from web cache

Hi,
We are facing a strange and serious problem with our Oracle infrastructure. We have running a web application that uploads files to the database server. But we have found out that if we try to upload a ZIP file (in the application, uploading a ZIP file means that it uncompresses the ZIP file and copy the zipped files one by one to the database server, therefore this operation can take a while), it comes an error message of the type:
No Response from Application Web Server
We didn't find any especial configuration for a timeout in the application server and http server. We also checked the timeout for the web cache that we also use, and seems to be alright (very much longer that the time to crash). When using the application without going through the Web Cache (calling directly the application server), it works well!!! On the other hand, we thought in a relation between the size of the files and the effort of the application to process them and the "No response", but we have successfully uploaded other documents bigger than the ZIP file. When checking the LOG files of the Web Cache and the Apache and application server, we find the following:
Webcache
[06/Dec/2006:13:47:18 +0100] [internal 11396] [ecid: 20482077186490,0] unknown internal error
[06/Dec/2006:13:47:19 +0100] [req-info] [ecid: 13486197309440,0] [client: 139.191.202.56] [host: odin.jrc.nl] [url:/doma/DocumentUploadFile]
[06/Dec/2006:13:47:19 +0100] [warning 14013] [ecid: 13486197309440,0] Send request to origin server times out.
[06/Dec/2006:13:47:19 +0100] [error 11364] [ecid: 13486197309440,0] Network error response is returned.
[06/Dec/2006:13:47:19 +0100] [error 11385] [ecid: 13486197309440,0] The request fails because the service is unavailable.
[06/Dec/2006:13:47:33 +0100] [req-info] [ecid: 20464897332666,0] [client: 139.191.207.213] [host: odin.jrc.nl:443] [url: /_oracle_http_server_webcache_static_.html]
[06/Dec/2006:13:47:33 +0100] [internal 11396] [ecid: 20464897332666,0] unknown internal error
[06/Dec/2006:13:47:48 +0100] [req-info] [ecid: 20447717478842,0] [client: 139.191.207.213] [host: odin.jrc.nl:443] [url: /_oracle_http_server_webcache_static_.html]
[06/Dec/2006:13:47:48 +0100] [internal 11396] [ecid: 20447717478842,0] unknown internal error
Apache
[Wed Dec 6 13:47:19 2006] [error] [client 139.191.207.213] [ecid: 15272903704576,1] MOD_OC4J_0080: After calling Apache's ap_bwrite(), got an return value: -1 and the client could have aborted in the middle of receiving the chunk data.
[Wed Dec 6 13:47:19 2006] [error] [client 139.191.207.213] [ecid: 15272903704576,1] MOD_OC4J_0058: Failed to handle response chunk data passed in from oc4j via ajp13.
[Wed Dec 6 13:47:19 2006] [error] [client 139.191.207.213] [ecid: 15272903704576,1] MOD_OC4J_0035: After handling ajp13 response message, got an invalid value: -2.
[Wed Dec 6 13:47:19 2006] [error] [client 139.191.207.213] [ecid: 15272903704576,1] MOD_OC4J_0121: Failed to service request with network worker: ODIN_HOME_15 and it is not recoverable.
[Wed Dec 6 13:47:19 2006] [error] [client 139.191.207.213] [ecid: 15272903704576,1] MOD_OC4J_0013: Failed to call destination: ODIN_HOME's service() to service the request.
[Wed Dec 6 13:47:20 2006] [error] [client 139.191.207.213] [ecid: 15187004358656,1] MOD_OC4J_0080: After calling Apache's ap_bwrite(), got an return value: -1 and the client could have aborted in the middle of receiving the chunk data.
[Wed Dec 6 13:47:20 2006] [error] [client 139.191.207.213] [ecid: 15187004358656,1] MOD_OC4J_0058: Failed to handle response chunk data passed in from oc4j via ajp13.
[Wed Dec 6 13:47:20 2006] [error] [client 139.191.207.213] [ecid: 15187004358656,1] MOD_OC4J_0035: After handling ajp13 response message, got an invalid value: -2.
[Wed Dec 6 13:47:20 2006] [error] [client 139.191.207.213] [ecid: 15187004358656,1] MOD_OC4J_0121: Failed to service request with network worker: ODIN_HOME_15 and it is not recoverable.
[Wed Dec 6 13:47:20 2006] [error] [client 139.191.207.213] [ecid: 15187004358656,1] MOD_OC4J_0013: Failed to call destination: ODIN_HOME's service() to service the request.
ODIN_HOME/log/ODIN_HOME_default_island_1
139.191.207.211 - - [06/Dec/2006:15:58:57 +0100] "GET /doma/DoMaBlobInterface.jsp HTTP/1.1" 200 3032
139.191.207.211 - - [06/Dec/2006:15:59:03 +0100] "GET /doma/DoMaBlobInterface.jsp HTTP/1.1" 200 3032
139.191.207.211 - - [06/Dec/2006:15:59:08 +0100] "GET /doma/DoMaBlobInterface.jsp HTTP/1.1" 200 3032
139.191.207.211 - - [06/Dec/2006:15:59:13 +0100] "GET /doma/DoMaBlobInterface.jsp HTTP/1.1" 200 3032
139.191.207.211 - - [06/Dec/2006:15:59:18 +0100] "GET /doma/DoMaBlobInterface.jsp HTTP/1.1" 200 3032
139.191.207.211 - - [06/Dec/2006:15:59:23 +0100] "GET /doma/DoMaBlobInterface.jsp HTTP/1.1" 200 3032
139.191.207.211 - - [06/Dec/2006:15:59:28 +0100] "GET /doma/DoMaBlobInterface.jsp HTTP/1.1" 200 3032
139.191.207.211 - - [06/Dec/2006:15:59:33 +0100] "GET /doma/DoMaBlobInterface.jsp HTTP/1.1" 200 3032
139.191.207.211 - - [06/Dec/2006:15:59:40 +0100] "GET /UserMgmt/home.jsp HTTP/1.1" 200 789
Could it be that the Web Cache sent a request to the application server and because of an unknown reason, it received a response that made it to show the "No response" message. Or could it be that the Web Cache is sending request and not receiving any response from the application server, or that there is some timeout configuration that we didn't find??? Please, help!!!!
Thanks in advance,
Luis

We found the core issues was with the number of database connections that were created during load testing. Refactoring the code to reuse the database connections fixed this issue.
Thanks,
Dom

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