Apache:
/usr/local/apache/logs/access_log
/usr/local/apache/logs/error_log
各自帳號的:
/usr/local/apache/domlogs

MySQL:
/var/lib/mysql/xxxx.err
(xxxx 跟 host name 同)

FTP:
/var/log/messages

Mail (exim):
cpanel 是透過 exim 進行發收郵件，所以郵件的部份需查詢:
/var/log/exim_mainlog
/var/log/exim_rejectlog

Cpanel:
cpanel本身也會記錄部份使用資訊，比方說cpanel的登出入，webmail的登出入……等等
請查詢:
/usr/local/cpanel/logs
/usr/local/cpanel/logs/access_log
/usr/local/cpanel/logs/error_log

以上部份，供大家除錯時使用。