![]() ![]() An external DNS server with both A and MX valid records to point to your Zimbra mail server IP Address.ĬANNOT CONNECT TO THE ZCS UPSTREAM SERVER HOW TO.A clean minimal installation of CentOS 8/ RHEL 8 or CentOS 7/ RHEL 7 without any mail, databases, LDAP, DNS, or Http servers up and running.A static IP Address assigned to a network interface.ġ. In case the policy is set to Enforced disable it by issuing the below commands: # getenforce Next, issue getenforce command to check if Selinux is enabled on your machine.īefore we proceed with Zimbra Collaboration Suite installation process, first log in to your server console with root privileges and install the following packages: # yum -y install unzip net-tools sysstat openssh-clients perl-core libaio nmap-ncat libstdc++.so.6Ģ. To completely disable Selinux on CentOS, open /etc/selinux/config file with a text editor and set the line SELINUX to disabled.ģ. CANNOT CONNECT TO THE ZCS UPSTREAM SERVER HOW TO.
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