1) Clients can only connect to the Service Bus, if they have the SB certificates in their Certificate Store. The ServiceBus certificates, if autogenerated, can be found using the cmdlet: Get-SBAutoGeneratedCA.
2) Second we either need to use Shared Access Key or Windows STS Uri. If ServiceBus is installed in a domain and the client (Windows 7) is not connected to the domain (example – Corpnet), then its better to use Shared Access Key, which can be retrieved by the cmdlet: Get-SBAuthorizationRule. There are mainly 3 rights –Listen, Send, Manage.
3) Third – To create Topics, Queues and other admin related task, the user must be a part of ManageUsers collection of the ServiceBus Namespace, which can be retrieved by the cmdlet: Get-SBNamespace.