I have seen this happen on Unix/Linux systems occasionally.  Check the entry
for 'hosts' in the /etc/nsswitch.conf file.  Verify that it is 'hosts: dns
files".  This will force NetWorker to check DNS before the /etc/hosts file.
Also, verify that the /etc/hosts file is organized "IP  FQDN  ALIAS".  If
the NetWorker server can't communicate with your DNS servers for some
reason, NetWorker will then check /etc/hosts.  If the alias is listed before
the fqdn in /etc/hosts, you will run into this issue again.

On Tue, Jan 12, 2010 at 3:28 PM, Tom Birkenbach <tom.birkenbach AT wmich DOT 
edu>wrote:

> I came across this oddity and wanted to share it with the community.
>
> When performing a new install of NetWorker, be sure you have your HOSTS
> file
> setup correctly where the servers own entry is setup as:
> IP    full.domain.name   shortname
> e.g.
> 141.218.1.15    backupmaster.backup.acme.com    backupmaster
>
> What happened to me was that I had the short name and full name reversed
> (the HOSTS entry as: 141.218.1.15    backupmaster
> backupmaster.backup.acme.com), so after NetWorker was installed it created
> its client entry for itself based on the short name and not the full domain
> name.  When attempting to do backups outside its own segment, it would fail
> name resolution.  After re-ordering the entry in the HOSTS file (i.e. as:
> 141.218.1.15    backupmaster.backup.acme.com    backupmaster) and
> re-installing NetWorker, the servers client entry was built with the full
> domain name.
>
> I found it odd that never during the install was I presented with an
> opportunity to set the server name, it just created it.  And as DNS-centric
> as NetWorker seems to be, it queried the HOSTS file for a name rather than
> performing a reverse lookup on itself.  Regardless of the reasoning or how
> it's supposed to work, I wanted to share this in case others come across
> this oddity.  Good luck!!
>
> -Tom B.
>
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