Premature end of script headers: index.php, mod_fcgid: read data timeout in 61 seconds

If you can access Linux server please edit /etc/httpd/conf.d/fcgid.conf file with vim.
Change FcgidIOTimeout 45 to FcgidIOTimeout 600.
Restart Apache.
Then Fast CGI timeout will be solved.

I had this problem on a MediaTemple Grid instance with a Drupal7 install; turns out it was being caused by FastCGI; switching to normal / stable CGI seems to have fixed the issue.

If you're using virtual hosts (in my case i've ispconfig) you need to do changes in virtual host config files. These files are under /etc/httpd/conf/sites-available for each virtual host. Just edit your desired config file, locate IPCCommTimeout and set current value to a higher number. You may need to do this change for both variables in same config file in case you have regular and SSL sites.