Am 24.06.2016 um 21:58 schrieb Joe Muller:
Just an update on this issue, if anybody is following. We have eliminated the
Load Balancer and the Firewall as a possible cause. Our last test was directly
between the IE client browser and the Apache 2.4 proxy server, resulting in the
same errors in the Apache logs similar to this:
*****Exception type] [WRITE_ERROR_TO_CLIENT raised at line 560 of
BaseProxy.cpp, refer:
https://intgalf.xyz.com/ALFA/selectFileType.do?fileType=O1MM
We also tested using different browsers (IE, Fire Fox, Chrome, and had mixed
results, but eventually we saw the same errors from the Weblogic 12c plug-in
the Apache logs at some point.
So at this point it is down to the Apache proxy and/or the Oracle Weblogic 12c
Plug-in for Apache. Anybody have any ideas ? I am out of them right now :-(
Perhaps it has something to do with the Apache 2.4 compilation options ? If I
had known before that going with Apache 2.4 instead of IPlanet would have been
this difficult we would have just purchased Oracle HTTP Server. At least we
would have full Oracle support through and through, although that may not be
saying much, since it is based on Apache 2.2. Also I am worried about
Oracle compatibility with 3rd party plug-ins like RSA Access Manager (SSO) and
Tea Leaf.
To be honest I am surprised Oracle doesn't give more guidance on this. I
would think we wouldn't be the first people to encounter this, but based on the
lack of information in their knowledge base and the response from their
technical support it seems otherwise.
I'd sniff the network in front of Apache and when the problem happens
filter the raw sniff packet dump file using the connection information
from the error log line ("[client 10.165.254.1:28171]"). Then use the
time stamp of the error message and look at the sniff of the single
connection what happens before the error is logged.
In case you are using https and you can switch on a reproduction system
to http this might help understanding the packet dump, but in general
this approach could also be used for https.
Regards,
Rainer
-----Original Message-----
From: Mike Rumph [mailto:mike.ru...@oracle.com]
Sent: Monday, June 20, 2016 4:08 PM
To: users@httpd.apache.org
Subject: Re: [users@httpd] Issues migrating Weblogic proxies from Sun One 6.1
to Apache 2.4
Hello Joe,
It seems to me that mod_reqtimeout applies to the amount of time a allowed for
the server to receive the request from the client (Read from client).
But your errors are indicating a problem on the Write to client.
As I am understanding our WLS plugin developer, the problem seems to be that
when the server has readied a response to send back to the client, the client
has already dropped the connection.
So in your topology this could be client browser, firewall or load balancer.
Have you considered the email responses from Todd Simons and Daniel?
The response from Daniel concerning the load balancer may be the most pertinent.
Thanks,
Mike
On 6/20/2016 11:11 AM, Joe Muller wrote:
I checked our httpd.conf and we do have reqtimeout_module already loaded,
however there is nothing set. According to the Apache 2.4 documentation the
default values are:
Default: header=20-40,MinRate=500 body=20,MinRate=500
Wouldn't you think that should be high enough ? I know for a fact
that the data is not taking 20-40 seconds to post in these
applications, as the users are not waiting that long. They are only
seeing slowdowns of a few seconds between pages (which in network time
is pretty long, ecspecially accessing the applications locally and not
coming in from over the internet.)
-----Original Message-----
From: Mike Rumph [mailto:mike.ru...@oracle.com]
Sent: Monday, June 20, 2016 10:45 AM
To: users@httpd.apache.org
Subject: Re: [users@httpd] Issues migrating Weblogic proxies from Sun
One 6.1 to Apache 2.4
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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