[error] server reached MaxClients setting ??

[jackop]

My apache server was suddenly down. I checked apache error logs, which is like the below,

[Wed Feb 08 07:37:51 2006] [notice] child pid 32419 exit signal Segmentation fault (11)
............ (numerous records. intermittently every a few minutes)
[Wed Feb 08 13:45:13 2006] [error] server reached MaxClients setting, consider raising the MaxClients setting

(Almost from this time, the websites are not accessable)
[Wed Feb 08 13:49:14 2006] [warn] child process 24619 still did not exit, sending a SIGTERM
.............. (numerous records. continuously)
[Wed Feb 08 13:49:56 2006] [error] child process 24619 still did not exit, sending a SIGKILL
.............. (numerous records. continuously)
[Wed Feb 08 13:49:57 2006] [error] could not make child process 24619 exit, attempting to continue anyway
.............. (numerous records. continuously)


My server is new with Plesk 7.5.4 and Fedora C3 pre-installed.
I just added 3 domains and didn't change any apache settings. My websites were working fine
on a shared server before.

What can be the reason that caused the server down? Any comments are welcome.