Hi everyone,
The long and the short of my issue is i recently moved from a shared hosting environment to a VPS hosting environment. Transfer of all databases went to plan and have all our sites live on our new host. However one issue has come to light, that seems to effect all domains however the error occurs on only one.

This domain is our main focus with anywhere from 10 - 50 new pieces of content added daily (using a Wordpress installation as the backend). Recently we started to see 500 Internal Server Errors at random when adding new content, however the errors were intermittent and a lot of the time, even though the browser would show a 500 error after a couple of minutes the content would still successfully post.

When we look at the error log for the domain we see the following that is relevant:

[/code][Tue May 17 21:34:41 2011] [warn] [client ###.###.###.###] Timeout waiting for output from CGI script /var/www/cgi-bin/cgi_wrapper/cgi_wrapper, referer: http://www.our-domain.com/content/wp-admin/post-new.php
[Tue May 17 21:34:41 2011] [error] [client ###.###.###.###] Premature end of script headers: cgi_wrapper, referer: http://www.our-domain.com/content/wp-admin/post-new.php [code]

When the error occurs, it appears NONE of the PHP driven sites on our VPS will display, all sit at the 'Waiting for domain-name.com' process when we try to load them so is it possible that there is something corrupt (php.ini?) or something thats not working properly on our server side?

Have been trying to work this issue out for a few weeks now and am coming up blank so hoping somebody with some expertise can give us some advice!

Look forward to your insight.

Warm Regards,
Ewan.