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If you are having trouble with your Apache server software, you should take the following steps:
/usr/local/apache2/logs/error_log, but see the
ErrorLogdirective in your config files for the location on your server.
Users mailing list
If your problem involves the server crashing and generating a core dump, please include a backtrace (if possible). As an example,
# cd ServerRoot
# dbx httpd core
(Substitute the appropriate locations for your ServerRoot and your httpd and core
files. You may have to use
gdb instead of
With several million users and fewer than forty volunteer developers, we cannot provide personal support for Apache. For free support, we suggest participating in a user forum.
Professional, commercial support for Apache is available from a number of companies.
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.
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
To fix this problem, simply use the
directive to disable
sendfile for all or part of your server. Also see the
EnableMMAP, which can help with similar problems.
If you get error messages related to the
AcceptEx syscall on win32, see the
Most problems with CGI scripts result in this message written in the error log together with an
Error delivered to the browser. A guide to helping debug this type of problem is available in the
Apache 1.3 faq
Apache Server Frequently Asked Questions
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Last modified: March 12, 2019