Unclearly power off might cause damage to OpenLDAP database, it will hangs while system startup. It's recommended to decrease sshd start order to make sure you can always log into server for maintaince.

Steps:

- Open /etc/init.d/sshd, find below line (line 4):

# chkconfig: 2345 55 25

- Change '55' to '13'.

# chkconfig: 2345 13 25

Start order of service "network" is 10, "syslog" and "rsyslog" is 12, so '13' is good for 'sshd'.

P.S.
- iRedMail (later than 0.7.0-beta1) will change it by default.
http://code.google.com/p/iredmail/sourc … c9cac7d426

- Reported this issue as a bug to RedHat:
https://bugzilla.redhat.com/show_bug.cgi?id=666776