Thanks for the reply.
The FQDN server name is correct and I can resolve this from a client system.
I don't want the client to be a Site Server running task services, sorry, that part was a bit confusing.
The initial inventory task that runs fails. The exact Result: Failure - return code -1.
Does the task server need to be the same as the Altiris server or can they be different? I am also thinking maybe the task server is out of licenses, but I don't have access to determine this.