Im running Windows Server 2008 R2 Ent; 64bit; using Veritas NetBackup Client 6.5.6.
Receiving an NetBackup Error: "client is not validated to use the server."
The Windows Server 2008 R2 is the client.
What can I do to not have this error anymore?
You haven't really provided enough info, but here's the page of the (7.0.1 - sorry, we didn't have a 6.5) Status Code guide which may give you a good start on what to check:
Check name resoloution and full qualifyed domain names. srv1.acme.com and srv1 is not the same in Netbackup terms.
When are you getting the error, during a backup or restore?
Let's see the full message you are getting. Also has this ever worked before for this client?