Error 500 with 2 domain

[theprincy]

on two domains in the management admin error exit 500, the first (assolavori.it) uses wordpress, the second (revlab.net) uses AWBS.
The following portion of the log error of the two domains.

wordpress

Code:

- - [17/Sep/2009:13:57:19 +0200] "GET /wp-admin/edit.php?post_status=draft&s=&deleteit=Cancella&_wpnonce=cd774590f5&_wp_http_referer=%2Fwp-admin%2Fedit.php%3Fpost_status%3Ddraft&m=0&cat=0&delete%5B%5D=14489 HTTP/1.1" 500 468 "http://www.assolavori.it/wp-admin/edit.php?post_status=draft" "Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.4; it; rv:1.9.1.3) Gecko/20090824 Firefox/3.5.3"

I also enabled in php.ini error_log but strangely is always 0 , can someone tell me how to solve?

ps :
could do the ping on this ip and tell me the result thanks

151.1.153.32
151.1.154.40
151.1.155.126
151.1.153.24

[gOOvER]

Errorlogs of the Domains?

[theprincy]

I resolved to a domain, I can not understand that other error

[Thu Sep 17 16:15:54 2009] [error] [client 87.21.213.103] FastCGI: incomplete headers (0 bytes) received from server "/var/www/fcgi/assolavori.it/php5-fcgi-starter", referer: http://www.assolavori.it/wp-admin/$


here I realized that I must increase the execution time

[Thu Sep 17 16:15:54 2009] [error] [client 87.21.213.103] FastCGI: comm with (dynamic) server "/var/www/fcgi/assolavori.it/php5-fcgi-starter" aborted: (first read) idle timeout (30 sec), referer: http://www.as$

[theprincy]

now i have this error FastCGI: incomplete headers (0 bytes) received from server "/var/www/fcgi/assolavori.it/php5-fcgi-starter"

how to correct it?

[Sat Sep 19 20:53:56 2009] [warn] FastCGI: (dynamic) server "/var/www/fcgi/assolavori.it/php5-fcgi-starter" (pid 2724) termination signaled
[Sat Sep 19 20:53:56 2009] [warn] FastCGI: (dynamic) server "/var/www/fcgi/assolavori.it/php5-fcgi-starter" (pid 2724) terminated by calling exit with status '0'
[Sat Sep 19 20:54:07 2009] [error] [client 79.19.244.87] FastCGI: comm with (dynamic) server "/var/www/fcgi/assolavori.it/php5-fcgi-starter" aborted: (first read) idle timeout (120 sec), referer: http://www.assolavori.it/wp-admin/edit.p...atus=draft
[Sat Sep 19 20:54:07 2009] [warn] FastCGI: (dynamic) server "/var/www/fcgi/assolavori.it/php5-fcgi-starter" (uid 2001, gid 2001) restarted (pid 2728)
[Sat Sep 19 20:54:07 2009] [error] [client 79.19.244.87] FastCGI: incomplete headers (0 bytes) received from server "/var/www/fcgi/assolavori.it/php5-fcgi-starter", referer: http://www.assolavori.it/wp-admin/edit.p...atus=draft