hosts file

When upgrading Zimbra, one of the first things it does is check your hosts file for two entries. It needs a valid localhost entry (the mysql setup is sensitive about this) and it needs a valid host FQDN entry for the server itself.

It wants to see something like this:

192.168.12.5   mail.xxxxxxxxxxx.com mail
127.0.0.1      localhost.localdomain localhost

The upgrade script kept complaining that my hosts file was incorrect, but those two entries where there and they looked fine.

Here's the error (sic):

 ERROR: Installation can not proceeed.
  Please fix your /etc/hosts file

So...