SonicOS supports versions 1.0, 1.1, and 1.2 of the Transport Layer Security (TLS) protocol. You can ensure that the more secure version 1.1 and above are used.
To enforce use of TLS versions 1.1 and above
Navigate to Device | Settings > Administration.
Click Management.
In the WEB MANAGEMENTS SETTINGS section, enable Enforce TLS 1.1 and Above.