Plesk auto update crashes FastCGI support

Question

Normally I use PHP as FastCGI. My Plesk panel is auto-updated yesterday from v11.0.9 #55 to #56.
After that update FastCGI soesn't work, but Apache PHP module works.

When I activate FastCGI I get thousands of this error:

[Fri Aug 09 21:50:02 2013] [warn] [client 5.47.201.9] (104)Connection reset by peer: mod_fcgid: error reading data from FastCGI server
[Fri Aug 09 21:50:02 2013] [error] [client 5.47.201.9] Premature end of script headers: index.php

I found this in Parallel's forum: http://forum.parallels.com/showthread.php?289665-After-Upgrade-to-11-5-Fast-Cgi-Stop-Working
but it didn't help for Plesk 11.

I found this: http://kb.parallels.com/en/6380
At the end of the /etc/psa/psa.conf file I added CGI_PHP_BIN /usr/bin/php-cgi and restarted server, it didn't worked.

My web server now works with apache-php but it kills my site. Please help.

Solution: Regarding to @Oleg Neumyvakin's questions I checked many things and found out that current "php.ini" file is inconsistent with new PHP version. I copied PHP 5.4's php.ini file to /etc/php.ini and problem solved.

Answer 1

1. SElinux?

2. What is permissions on /var/www/cgi-bin/cgi_wrapper/cgi_wrapper?

   should be -rwxr-xr-x 1 root root 3660 Jun 6 2012 /var/www/cgi-bin/cgi_wrapper/cgi_wrapper

3. What in /var/log/apache2/suexec.log or /var/log/httpd/suexec_log ?

4. Permissions on suexec ? Find all files, check permissions: find / | grep suexec

5. Custom php.ini on domain / custom php settings on domain? Is their is compatible with current PHP version?

6. What happens if run php script in cli mode like: php -c /var/www/vhosts/domain.tld/etc/php.ini /var/www/vhosts/domain.tld/httpdocs/index.php

7. Connection reset by peer: mod_fcgid: error reading data from FastCGI server