some of our users complain about random \"Internal Server errors\" on ther Joomla 1.5/2.5/3.4 or Wordpress pages.
In the /usr/local/apache/logs/error_log I see the following errors:
[Wed Apr 29 10:04:25.120285 2015] [core:error] [pid 240710] [client x.x.x.x:49174] End of script output before headers: index.php, referer: http://otherdomain.com/wp-login.php
[Tue Apr 28 12:59:29.325574 2015] [core:error] [pid 649284] [client y.y.y.y:57294] Premature end of script headers: index.php, referer: http://domain.com/index.php?page=shop.cart&option=com_virtuemart&Itemid=1
Some use PHP 5.3, some php 5.4 (both via cagefs). System is a CentOS 6.5 with cPanel and CloudLinux.
Any suggestions I should check? (I\'ve already checked the statistics and I don\'t see any problems there.