Strange Issue with ACE Cookie Stickiness - HTTP 503 Service Unavailable

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May 9th, 2010
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I have configured cookie based stickiness on a serverfarm with two nodes. I have noticed that only 'few' pages on our web site experiences a hang (blank white page/HTTP 503 - Service Unavailable) due to enabling the cookies. The stickiness continues to work properly though.

However, if I were to disable cookies and enable source IP based stickiness, the whole web site runs perfectly without any issues.

I have also checked the release notes to see if similar bugs have been reported. Please advise what could be the reason for this strange issue and how could it be fixed.

ACE Module Version: A2(2.0) Buld 3.0(0)A2(2.0)


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UHansen1976 Mon, 05/10/2010 - 11:28
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Have you taken a look at the webserver log? Any chance the presence of the ACE-generated cookie presents a problem at the webserver?

I would probably run a trace to see what actually happens when this error occurs. Also, try'n take a look at the http-stats on the ACE, 'show stat http', and see if ACE reports an unexpected level of errors. I've experienced issues with abnormal session termination, simply because the http-header exceeded the default header-length, that ACE permits.

c-fwagner Mon, 10/11/2010 - 13:57
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Stumbled across the same problem.  Anyone found a solution?

Pablo Mon, 10/11/2010 - 14:14
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As UHansen1976 mentioned this kind of issues are most of the times related to parse-length buffer size being exceeded.

Please paste the output of the following commands:

ACE-K/Admin# sh np 1 me-stats "-shttp -v" | include parse

ACE-K/Admin# show stats http

Did you run into the same problem when the sticky method was changed to Sticky-SrcIP?


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c-fwagner Wed, 10/13/2010 - 03:53
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Found some max parslen errors and set it to 16384. Counters do not increase now, but i still have the problem with the sharepoint IIS7 in the background.


Service Unavailable

HTTP Error 503. The service is unavailable.

from the ACE. Have switched from http cookie stickyness to ip stickyness, with no success. Seems like it has even get worse.

Don't know where the problem resides. Maybe with integrated windows authentication ntlm needed?



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