Sorry about for my english, it's so badly . I using Centos 5.1 and Release 5.0.7_GA_2444.RHEL5_20080626020941 CentOS5 This is file configure DNS [root@mail zcs-5.0.7_GA_2444.RHEL5.20080626020941]# vi /var/named/chroot/var/named/db.mail.vietnamdauyeu.host [root@mail zcs-5.0.7_GA_2444.RHEL5.20080626020941]# vi /var/named/chroot/etc/named.conf [root@mail zcs-5.0.7_GA_2444.RHEL5.20080626020941]# cat /etc/hosts [root@mail zcs-5.0.7_GA_2444.RHEL5.20080626020941]# cat /etc/resolv.conf [root@mail zcs-5.0.7_GA_2444.RHEL5.20080626020941]# uname -a When I acces with user zimbra I installed complete Zimbra but I don't access to my site https://mail.vietnamdauyeu.host or https://mail.vietnamdauyeu.host:7071 I read this tutorial to install Zimbra http://howtoforge.com/zimbra-collaboration-suite-open-source-edition-on-centos Many thanks, vietnamdauyeu