Jika anda mendapati Apache tiba-tiba mati tanpa sebab coba perhatikan error lognya
tail -n 300 /var/log/httpd/error_log | more
dan jika anda menemukan error seperti ini
[Wed Apr 18 15:23:28 2012] [emerg] (43)Identifier removed: couldn't grab the accept mutex [Wed Apr 18 15:23:28 2012] [emerg] (43)Identifier removed: couldn't grab the accept mutex [Wed Apr 18 15:23:28 2012] [emerg] (43)Identifier removed: couldn't grab the accept mutex [Wed Apr 18 15:23:28 2012] [emerg] (43)Identifier removed: couldn't grab the accept mutex [Wed Apr 18 15:23:28 2012] [emerg] (43)Identifier removed: couldn't grab the accept mutex [Wed Apr 18 15:23:28 2012] [emerg] (43)Identifier removed: couldn't grab the accept mutex [Wed Apr 18 15:23:28 2012] [emerg] (43)Identifier removed: couldn't grab the accept mutex
Sesuai dengan referensi maka tambahkan baris ini ke httpd.conf
AcceptMutex flock AcceptMutex posixsem
Silahkan baca referensi penyelesaiannya disini
http://help.directadmin.com/item.php?id=411