Error Messages - Frequently Asked Questions

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Error Messages

Invalid argument: + core_output_filter: writing data to the network
AcceptEx failed
Premature end of script + headers

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Invalid argument: + core_output_filter: writing data to the network

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Apache uses the sendfile syscall on platforms + where it is available in order to speed sending of responses. + Unfortunately, on some systems, Apache will detect the presence of + sendfile at compile-time, even when it does not work + properly. This happens most frequently when using network or + other non-standard file-system.

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Symptoms of this problem include the above message in the error + log and zero-length responses to non-zero-sized files. The + problem generally occurs only for static files, since dynamic + content usually does not make use of sendfile.

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To fix this problem, simply use the EnableSendfile directive to disable + sendfile for all or part of your server. Also see + the EnableMMAP, which can + help with similar problems.

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AcceptEx Failed

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If you get error messages related to the AcceptEx syscall + on win32, see the Win32DisableAcceptEx + directive.

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Premature end of script + headers

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Most problems with CGI scripts result in this message written in the + error log together with an Internal Server Error delivered + to the browser. A guide to helping debug this type of problem is + available in the CGI + tutorial.

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