If using RedHat or SuSE
Type the command rpm -Uvh and then the name of the installer (i.e. kerio-mailserver-6.1.3build889-linux.i386.rpm)
Stop and restart the Kerio MailServer service using the command /etc/rc.d/init.d/keriomailserver restart
now start the server /etc/rc.d/init.d/kerio-connect start