Problem add user 181

[kurgans]

Good night,

I have a Debian servant with ispcp and have lodged 180 users, when adding a new user the servant gives error and the Web server does not work, I must modify something in the panel to admit but usuary.

My problem this in the use of the fast-cgi giving error of socket

[Fri Apr 04 17:04:31 2008] [crit] (24)Too many open files: FastCGI: can't create (dynamic) server "/var/www/fcgi/anuncios-on.com/php5-fcgi-starter": socket() failed
[Fri Apr 04 17:04:44 2008] [error] (24)Too many open files: apr_socket_accept: (client socket)
[Fri Apr 04 17:04:45 2008] [error] (24)Too many open files: apr_socket_accept: (client socket)
[Fri Apr 04 17:04:45 2008] [error] (24)Too many open files: apr_socket_accept: (client socket)
[Fri Apr 04 17:04:46 2008] [alert] No active workers found... Apache is exiting!

I modify apache with

start)....................
echo -n "Starting web server: Apache2"
ulimit -n 65535
$APACHE2CTL startssl
..............................................
reload)
echo -n "Reloading web server config..."
ulimit -n 65535
$APACHE2CTL graceful $2
......................................
restart | force-reload)
echo -n "Forcing reload of web server: Apache2"
apache_stop
ulimit -n 65535
$APACHE2CTL startssl

but I follow with the same problem when I add user 181 my webs in php fail with Internal Error if I press F5 if php loads the Web
a friend this helping me in this forum and I test, change configuration but the continuous error somebody can say like fixing the problem to me.

Thanks