Can't display Dashboard - "You don't have permission to access /UI on this server."

Myron wrote:

The dashboard UI is only now accessible from an IP addess on the same Subnet as the the MyBook Live.

Thanks for your reply.

– That’s what I read about the subnet, too. But which subnet address do I have to assign to my computer?

DHCP, which would be the alternative, fails to establish a connection most of the time.