mod_fcgid: error reading data / Premature end of script headers: trac.fcgi

view story

http://serverfault.com – I have a Trac installation that is working fine on a Fedora 14 host. It uses Apache as the web server. I have a new Fedora 15 host that I am migrating the Trac instance onto. I installed the packages I need (yum for apache and mod_fcgi, easy_install for Trac and its plugins). Then I copied (using rsync) all the Trac data (both the "environment" and the part from /var/www). Now I've got it sort of set up, but when I try to view any page on the new host, it returns HTTP 500 Internal Server Error, and the httpd error_log says this: [Fri Aug 19 16:15:47 2011] [warn] [client] (104) (HowTos)