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When using the Zimbra Admin console, clicking a menu to open its page may display an error window with this message: " server zimbra.mail.ezymailhosting.com zimbraRemoteManagementPrivateKey
Soon after a server connects to the Internet, people begin trying to log in over SSH. If root login is allowed and the password is easy, the server may be compromised.
Use scp, sftp, and ssh with IPv6 addresses by enclosing the address in square brackets, as demonstrated with fe80::219:99ff:fe20:c251.
To prevent direct root login over SSH, edit #vi /etc/ssh/sshd_config and set PermitRootLogin to no: PermitRootLogin no. Then restart SSH.
