Web Cache Fails With Message "503 No Response from Application Server", And Error "Timeout during network receive, socket number Net_Recv_x" in event_log (Doc ID 889013.1)

Last updated on NOVEMBER 04, 2016

Applies to:

Web Cache - Version 10.1.2.0.2 and later
Information in this document applies to any platform.
Checked for relevance on 27-Dec-2013

Symptoms

Web pages occasionally end up with a "503 No Response from Application Server" error displayed in the browser and the Web Cache event_log contains the following error:

- <ORACLE_HOME>/webcache/logs/event_log
--------------------------------------------------
[10/Sep/2009:11:20:29 +0100] [trace 11331] [ecid: 2665619369589, 1] Request matches configured
site myhost.mydomain:80.
[10/Sep/2009:11:20:29 +0100] [trace 11953] [ecid: 2665619369589, 1] In ESI template
myhost.mydomain/portal/page/portal/BI_PORTAL/BI_PORTAL_CUSTOM_TEMPLATE?_mode=25&_bac
k_url=http%3A%2F%2Fmyhost.mydomain%2Fportal%2Fpage%2Fportal%2FBI_PORTAL%2FAnlyticsTa
sks%3F_mode%3D16, the fragment's site name and URL has been discovered as
myhost.mydomain and
http://myhost.mydomain/portal/page/portal/BI_PORTAL/BI_PORTAL_CUSTOM_TEMPLATE?_esiRe
qType=3
[10/Sep/2009:11:20:29 +0100] [trace 11304] [ecid: 2665619369589, 1] Cache miss request.
[10/Sep/2009:11:20:29 +0100] [debug 11310] [ecid: 2665619369589, 1] URL is not in the cache miss
table.
[10/Sep/2009:11:20:29 +0100] [trace 11224] [ecid: 2665619369589, 1] Site
myhost.mydomain:80 matches site-to-server mapping
myhost.mydomain:80.
[10/Sep/2009:11:20:29 +0100] [trace 11227] [ecid: 2665619369589, 1] Request is routed to origin
server myhost.mydomain:7778 using load balancing.
[10/Sep/2009:11:20:29 +0100] [req-info] [ecid: 72061479428005482,0] [client: <IPAddress>]
[host:
-] [url: -]
[10/Sep/2009:11:20:29 +0100] [trace 13351] [ecid: 72061479428005482,0] Timeout during network receive, socket number Net_Recv_x
[10/Sep/2009:11:20:29 +0100] [req-info] [ecid: 72063214594793080,0] [client: <IPAddress>]
[host:
-] [url: -]
[10/Sep/2009:11:20:29 +0100] [trace 13351] [ecid: 72063214594793080,0] Timeout during network receive, socket number Net_Recv_x
[10/Sep/2009:11:20:29 +0100] [trace 11398] [ecid: 72061479428005482,0] A client connection to
listening port 80 is dropped at the end of keep-alive session.
[10/Sep/2009:11:20:29 +0100] [debug 11353] [ecid: 72061479428005482,0] Network error during
client
receive. The error code is: IO Timeout.
[10/Sep/2009:11:20:29 +0100] [trace 11398] [ecid: 72063214594793080,0] A client connection to
listening port 80 is dropped at the end of keep-alive session.
[10/Sep/2009:11:20:29 +0100] [debug 11353] [ecid: 72063214594793080,0] Network error during
client
receive. The error code is: IO Timeout.
[10/Sep/2009:11:20:29 +0100] [debug 1] [ecid: -] NET_DEBUG: gracefulDisconnect: Closing socket
904
...
[10/Sep/2009:11:20:29 +0100] [debug 11320] [ecid: -] Connection count decremented. Current
connection count is 2.
[10/Sep/2009:11:20:29 +0100] [debug 1] [ecid: -] NET_DEBUG: gracefulDisconnect: Closing socket
1308 ...
[10/Sep/2009:11:20:29 +0100] [debug 11320] [ecid: -] Connection count decremented. Current
connection count is 1.
[10/Sep/2009:11:20:29 +0100] [trace 11403] [ecid: 2665619369589, 1] begin cacheability decision
for following url:

myhost.mydomain:80/portal/page/portal/BI_PORTAL/BI_PORTAL_CUSTOM_TEMPLATE?_esiReqTyp
e=3
[10/Sep/2009:11:20:29 +0100] [trace 11408] [ecid: 2665619369589, 1] URL does not match any
caching
rule.
[10/Sep/2009:11:20:29 +0100] [trace 11413] [ecid: 2665619369589, 1] The HTTP request method is
not
GET, or the URL contains query string parameters. The request is not cacheable.


While on the same timestamp no errors can be seen/recognized in Http Server access_log

To have more information about these symptoms, you can simply switch the web cache logging to debug level using the following note instructions:
<Note 1076037.1>  <How to Increase event_log Verbosity to DEBUG in Oracle WebCache 10g?>

Cause

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