For no special reason Drupal sites on our server (CentOS 5 with cPanel/WHM) started to make problems with file upload. Because Drupal 6/7 has use Ajax for file uploading the only thing that happens is that browser just hangs until timing out. Quick playing with different file sizes revealed that files that are less then 100kb are OK, but bigger files are creating problem. Of course php post_max_size and upload_max_filesize are set to 20mb so that was not causing problems. Strange...
Actually the biggest problem here was finding out what the hell is happening. I quickly created small html/php script with file upload form, and when testing with files bigger then 100kb I immediately got 500 internal server error - OK, that is something but still not telling much. Most annoying thing was fact that php error_log and apache logs that I was getting from Cpanel and WHM were error empty.
Yes in CentOS (managed with cPanel) you have logs all over the place. Finally founded master apache log that I needed and there was explanation
[Fri Dec 08 13:39:14 2013] [warn] [client 1.1.1.1] mod_fcgid: HTTP request length 132356 (so far) exceeds MaxRequestLen (131072), referer: http://www.test.com/.../upload.html
So MaxRequestLen from mod_fcgid (and we are running fast cgi for PHP) is limiting request length to only 130kb - If the size of the request body exceeds this amount, the request will fail with 500 Server Error. Fix is easy you just need to add in your httpd.conf next lines
# Work around annoying fcgid limitations
<IfModule mod_fcgid.c>
# 20MB should be enough
MaxRequestLen 20000000
</IfModule>
Actually the biggest problem here was finding out what the hell is happening. I quickly created small html/php script with file upload form, and when testing with files bigger then 100kb I immediately got 500 internal server error - OK, that is something but still not telling much. Most annoying thing was fact that php error_log and apache logs that I was getting from Cpanel and WHM were error empty.
Yes in CentOS (managed with cPanel) you have logs all over the place. Finally founded master apache log that I needed and there was explanation
[Fri Dec 08 13:39:14 2013] [warn] [client 1.1.1.1] mod_fcgid: HTTP request length 132356 (so far) exceeds MaxRequestLen (131072), referer: http://www.test.com/.../upload.html
So MaxRequestLen from mod_fcgid (and we are running fast cgi for PHP) is limiting request length to only 130kb - If the size of the request body exceeds this amount, the request will fail with 500 Server Error. Fix is easy you just need to add in your httpd.conf next lines
# Work around annoying fcgid limitations
<IfModule mod_fcgid.c>
# 20MB should be enough
MaxRequestLen 20000000
</IfModule>
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