it's been mentioned here before

that ping uses /etc/hosts. try running this:
$ dig a [zimbra hostname] # or
$ host [zimbra hostname]
those must return the local IP address of the machine. if you're planning to connect via localhost (i.e. 127.0.0.1), then zimbra must consider its hostname to be "localhost"
hmm.
Quote:
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hostname is resolveable via dns from every computer on the network but when I do a ping "zimbra hostname" from the fedora server it resolve on 127.0.0.1.
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what's in /etc/resolv.conf and /etc/hosts?