When I try to see the Zimbra statistic in the control panel, got the error messages like this …

Message: system failure: Unable to read logger stats Error code: service.FAILURE Method: GetLoggerStatsRequest Details:soap:Receiver

It seems the problems with Logger services. Trying to fix it by myself, it doesn’t work at all. Then see in the Zimbra forums, got if I need to install rsyslog.

# apt-get install rsylog

Then as root:

# /opt/zimbra/bin/zmsyslogsetup
# su - zimbra
at Zimbra-Sheel $ zmcontrol stop
at Zimbra-Sheel $ zmcontrol start

Well, at least it fixes my issues.