Server Error 324

[abintipl]

Hi,

My server setup Debian 6 sequeeze with lastest ISpconfig 3 was running fine.

Today, I tried installing owncloud & had run a command

apt-get install apache2 php5 php5-json php-xml-serializer zip php5-gd

After that all my wordpress & magento sites throwing an error
"Error 324 (net::ERR_EMPTY_RESPONSE)"

My server Error log is as under;

[Sun Nov 25 12:03:55 2012] [emerg] [client xxx.xxx.xxx.xxx] (13)Permissiondenied: mod_fcgid: can't lock process table in pid 4135

Please help

Thanks