SQLServer 2012搭建AlwaysOn报错：

Database Mirroring login attempt failed with error: 'Connection handshake failed. The certificate used by the peer is invalid due to the following reason: Certificate not found. State 89.'.  [CLIENT: 192.168.1.133]

在主从节点查看当前的 Endpoint：

select * from master.sys.database_mirroring_endpoints

删除当前主从的 ENDPOINT：

USE [master]

DROP ENDPOINT Endpoint_Mirroring

GO

重建AlwaysOn。

一切顺利，不再报错。