Hello Joe,
I am not in a position to offer an official Oracle statement for your situation.
But I do work closely with the owners of the WLS plug-ins.
Here is an initial evaluation from one of the developers:
"WRITE_ERROR_TO_CLIENT is typically seen when there is an error writing the response to the client (WLS plug-in client). This usually occurs when the user sends a request, but closes the browser (or hits a stop button) before the response is received by the client. In such a scenario, from the plug-in perspective, whenever response is received from WLS, it cannot relay it to the client as the connection is broken, and it logs WRITE_ERROR_TO_CLIENT error. This is usually a harmless error. If the above is not true (closing the browser etc), then it may be possible that the client timeout is too low (or lower than the WLS response time for the request). In such cases, the timeout needs to be increased. I am not aware of what parameters to look out for here, but mod_reqtimeout may be a good beginning."
I hope that this is helpful to you.
For more specific details, you would still need to contact official Oracle support channels.
Thanks,
Mike
On 6/17/2016 7:30 AM, Joe Muller wrote:
I am working on a project to migrate all our IPlanet 6.1 SP19 webserver proxies (formerly Sun One) to Apache 2.4, since IPlanet 6.1 does not support TLS 1.2 and IPlanet 7.0 is being EOL. Our backend application servers are Weblogic 9.2 / Weblogic 12c. The IPlanet proxies have performed FLAWLESSLY for over 10 years, despite the product being no longer supported and their WL Plug-in not officially supported with Weblogic 12c.
However now that we are trying to use a more supported configuration (self-compiled Apache 2.4.18 running Weblogic Server Plugin 12.1.3) we are constantly seeing these errors, which results in performance degradation for our applications, and in some cases I think maybe even lost data.
[Tue Jun 14 09:27:36.239682 2016] [weblogic:error] [pid 12513:tid 140185150932736] [client 10.165.254.1:28171] <1251314659108487> Write to the client failed: calling URL::close at line 559 of BaseProxy.cpp, referer: https://intgalf.xyz.com/ALFA/selectFileType.do?fileType=O1MM
[Tue Jun 14 09:27:36.239747 2016] [weblogic:error] [pid 12513:tid 140185150932736] [client 10.165.254.1:28171] <1251314659108487> **
*****Exception type [WRITE_ERROR_TO_CLIENT] raised at line 560 of BaseProxy.cpp, referer: https://intgalf.xyz.com/ALFA/selectFileType.do?fileType=O1MM
[Tue Jun 14 09:27:36.239952 2016] [weblogic:error] [pid 12513:tid 140185150932736] [client 10.165.254.1:28171] <1251314659108487> request [/ALFA/servlet/DecryptDownload?linkName=al_o1mm_carr20150630.csv] did NOT process successfully.................., referer:https://intgalf.xyz.com/ALFA/selectFileType.do?fileType=O1MM
Our topology is like this:
Client Browser <--> Firewall <--> Load Balancer <--> Web Proxies <--> Firewall <--> Weblogic Application Servers
Oracle support suggested as work around that we increase WLSocketsTimeOut in the plug-in, but I think that only masks the issue, as we still the errors.
We did a network trace and it looks like the Apache plug-in is pre-maturely closing the connection to the WL server, but I can't be certain. We know that our firewall is not responsible.
Any ideas ? I thought Apache would work better then Sun One, but this has been the opposite. Is there some fundamental webserver tunable parameter that is so different between out of the box Sun One and out of the box Apache that could be causing this ?
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