Once the backup script has run and the users can't login, can you actually see the DC? Can you try running an ldapsearch on your zimbra server against the DC (try the domain and subdomain) and see if it gives any results? Can you ping the DC from the Zimbra server after the failure? I assume the Zimbra server can still send and receive mail after the backup?
Do all your other machines and services that authenticate against the DC are still working OK at this point. I'm also assuming that the Zimbra server is just a Zimbra server and nothing else is on it, is that correct? What size file are you transferring to your backup server? I'm also making the assumption that your backup transfer is completed OK, have you ever verified that the backup file is correct? Is this a single or multiple NIC and/or IPs in the Zimbra server?
Which version/release of Zimbra is this?
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Regards
Bill
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