Here You can find all error Logs of directadmin
and you can solve the issues
Apache Logs
Logs Name Locations
Error Logs /var/log/httpd/error_log
Access Logs /var/log/httpd/access_log
SuExec Logs /var/log/httpd/suexec_log
FpExec Logs /var/log/httpd/fpexec_log
Domain Specific Error Logs /var/log/httpd/domains/{domain.tld}.error.log
Domain Specific Logs /var/log/httpd/domains/{domain.tld}.log
DirectAdmin Logs
Logs Name Location
Error Logs /var/log/httpd/error_log
Access Logs /var/log/httpd/access_log
SuExec Logs /var/log/httpd/suexec_log
FpExec Logs /var/log/httpd/fpexec_log
Domain Specific Error Logs /var/log/httpd/domains/{domain.tld}.error.log
Domain Specific Logs /var/log/httpd/domains/{domain.tld}.log
Exim Logs
Logs Name Location
Delivery and receipt log /var/log/exim/mainlog
Unexpected/Fatal error log /var/log/exim/paniclog
Process logs /var/log/exim/processlog
Reject logs /var/log/exim/rejectlog
FTP Logs
Logs Name Location
ProFTP Access Logs /var/log/proftpd/access.log
ProFTP Auth Logs /var/log/proftpd/auth.log
PureFTPd Logs /var/log/pureftpd.log
Dovecot and vm-pop3d
Logs Name Location
Maillog /var/log/maillog
Named (Bind) Logs
Logs Name Location
Bind logs included/var/log/messages
Cron Logs
Logs Name Location
Cron job logs/var/log/cron
MySQL Logs
Logs Name Location
MySQL error log /var/lib/mysql/{SERVER_NAME}.err MySQL slow query log (if enabled in my.cnf) /var/log/slowqueries