你好，
请查看日志文件 C:\ConfigMgrSetup.log，并把相关的错误信息贴上了。
还有确认一下，安装的用户是本地管理员和数据库的sysadmin。
同时，请参考下面的文档：
Unable to connect CAS or Primary to the SQL database during the System Center 2012 Configuration Manager setup
https://blogs.technet.microsoft.com/configurationmgr/2012/05/03/fix-unable-to-connect-cas-or-primary-to-the-sql-database-during-the-system-center-2012-configuration-manager-setup/
Please remember to mark the replies as answers if they help.
If you have feedback for TechNet Subscriber Support, contact
tnmff@microsoft.com.
