When you use AlwaysOn Availability Group, Database Mirroring, or Service Broker in Microsoft SQL Server, the encrypted endpoint communication with Transport Layer Security (TLS) protocol version 1.2 fails. Additionally, you receive the following error message in the SQL Server Error log:
Connection handshake failed. An OS call failed: (80090331) 0x80090331(The client and server cannot communicate, because they do not possess a common algorithm.). State 56.
The windows event log will report the following SChannel error:
A fatal alert was generated and sent to the remote endpoint. This may result in termination of the connection. The TLS protocol defined fatal error code is 40. The Windows SChannel error state is 1205.