Error: FastCGI: comm with server aborted: error parsing headers

    Hi,


    I've setup a complete blank debian wheezy vServer, installed i-MSCP and now I get an error 500 with the following apache error (when trying to install a joomla extension within joomla backend).


    Code
    1. [Thu Jul 03 10:25:51 2014] [error] [client 93.xxx.xxx.41] FastCGI: comm with server "/var/lib/apache2/fastcgi/php5-fcgi-<my-domain-name>.de" aborted: error parsing headers: invalid Status '-1 Kopieren <strong>fehlgeschlagen</strong>!', referer: http://vu2004.admin.vsrv*****.customer.vlinux.de/upgrade/administrator/index.php?option=com_installer


    There is no file "/var/lib/apache2/fastcgi/php5-fcgi-<my-domain-name>.de" on my server...


    I thought I have to enable the fastcgi apache2 modul so I did


    Code
    1. ln -s /etc/apache2/mods-available/fastcgi.conf /etc/apache2/mods-enabled/
    2. ln -s /etc/apache2/mods-available/fastcgi.load /etc/apache2/mods-enabled/


    and restarted apache2 and php5-fpm but I still get this error message.
    (reverted/disabled that fastcgi mods again...)



    update: I have now set "CGI" on that domain to "No" and now it worked.


    So what does this CGI switch do exactly? Thanks

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