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From Nick Kew <>
Subject Re: [users@httpd] Apache upgrade error
Date Thu, 03 Aug 2017 15:26:44 GMT

> On 3 Aug 2017, at 15:53, Deepak Kumar <> wrote:
> Hi, After apgrading Apache RPM packages from 2.4.12 to 2.4.25 on AIX 6.1, one apache
instance is not working and error_log is getting filled with below error messages. 

Looks like strict HTTP header processing has bitten you.

> [Wed Aug 02 23:57:17.644430 2017] [http:error] [pid 23461910:tid 4627] [client]
AH02429: Response header name 'P3P: policyref="/w3c/p3p.xml"' contains invalid characters,
aborting request

That’s presumably meant as a header P3P with value the policyref bit.
Somehow the server is seeing the whole line as a header name.
You should investigate and fix whatever sets the header.

Nick Kew
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