By default root login on SSH is prohibited.
This is done because root login is well-known, and to hack with Password brute-force it's enough to guess password.
To obtain root rights one should use sudo application like is described in section How to acquire root access.
Also those IP addresses, which have SSH access, are put into firewall white-list.
To add a new address, you should appeal to Streamco tech support, or have access to physical console.
This type of protection should protect against following types of attack: