[Sat Sep 26 22:02:33 2008] [error] [client 111.222.333.444] Premature end of script headers: phpinfo.php
[Sat Sep 26 22:02:33 2008] [error] [client 111.222.333.444] File does not exist: /home/username/public_html/500.shtml


First step: ensure that you’re using proper permissions on your files for suphp. Your php files should have 644 permissions, and ownership of the user whose home folder the files are in.

If ownership and permissions are correct, it could be a memory issue. I’ve found that some users who experience this error are running out of available memory for php to execute properly. You can try switching your PHP handler to cgi or fcgi, which will actually display an “out of memory” error in apache’s error_log, but suphp will not.


[Sat Sep 26 08:48:02 2009] [error] [client 111.222.333.444] Premature end of
script headers: php5
[Sat Sep 26 08:48:02 2009] [error] [client 111.222.333.444] File does not exist:
/home/username/public_html/500.shtml
[Sat Sep 26 08:48:02 2009] [error] [client 111.222.333.444] Out of memory


If you do have available RAM, but PHP isn’t able to use it, try increasing the RLimit value in httpd.conf and see if your script will execute then. If you look at “free” and you don’t have much free memory, you may need to upgrade your server or VPS.