This is a handy link and list of all the relevant Directadmin log files and related servers.
http://help.directadmin.com/item.php?id=11
DirectAdmin:
/var/log/directadmin/error.log
/var/log/directadmin/errortaskq.log
/var/log/directadmin/system.log
/var/log/directadmin/security.log
Apache:
/var/log/httpd/error_log
/var/log/httpd/access_log
/var/log/httpd/suexec_log
/var/log/httpd/fpexec_log
/var/log/httpd/domains/domain.com.error.log
/var/log/httpd/domains/domain.com.log
/var/log/messages (generic errors)
Proftpd:
/var/log/proftpd/access.log
/var/log/proftpd/auth.log
/var/log/messages (generic errors)
PureFTPd:
/var/log/pureftpd.log
Dovecot and vm-pop3d:
/var/log/maillog
/var/log/messages
named (bind):
/var/log/messages
exim:
/var/log/exim/mainlog
/var/log/exim/paniclog
/var/log/exim/processlog
/var/log/exim/rejectlog
(on FreeBSD, they have "exim_" in front of the filenames)
mysqld:
RedHat:
/var/lib/mysql/server.hostname.com.err
FreeBSD and Debian:
/usr/local/mysql/data/server.hostname.com.errTags:directadmin, locationsthis, relevant, servers, http, php, var, errortaskq, apache, httpd, error_log, access_log, suexec_log, fpexec_log, domains, domain, generic, errors, proftpd, auth, pureftpd, dovecot, vm, maillog, bind, exim, mainlog, paniclog, processlog, rejectlog, freebsd, quot, exim_, filenames, mysqld, redhat, lib, mysql, server, hostname, err, debian, usr,