If you have applied modsecurity rules either from OWASP or COMODO, you may see below error in /usr/local/apache/logs/error_log:
Failed to access DBM file “/var/cpanel/secdatadir/ip”: Permission denied
This is because you are using apache chroot jailed vhosts and mod_ruid2. To make it accessible you may have to change secdatadir to /var/log and give appropriate permission to your apache user.
I have searched and found many people suggest to remove rule ID, which I do not think is a good idea. So, to solve above error do as following:
$ sudo vi /etc/apache2/conf.d/modsec_rule_01.conf paste following SecDataDir "/var/log/secdatadir" save and exit $ sudo cp -R /var/cpanel/secdatadir /var/log/ $ sudo chmod 1733 /var/log/secdatadir $ sudo chown -R nobody:nobody /var/log/secdatadir $ sudo chmod ugo+rw /var/log/secdatadir/*
Check if everything is okay
$ httpd -t
$ sudo /scripts/restartsrv_httpd