I suggest you telnet first to test the connectivity of the database? Then check to see if there is anything wrong with the database server. Finally, make sure that the user name / password for connecting to the database is entered correctly.
in sqlserver2014 Administrative tools-Open Sql Server Configuration Manager and change the following settings to enable.
A, check whether the SQL service is started
start-Control Panel-Administrative tools-Services-sql server service-start
B, and in the case of a remote connection, check that the remote connection is set up.
1, start--> programs--> sql configuration tool-> sqlsever Peripheral Application Configurator
2, Click Service and connected Peripheral Application Configurator
3, Select remote connection
4, select Local and remote connection
5, select reverse use TCP/IP
6, click OK
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