If you have tried logging to MS SQL Server and are not able to access then please check as follows:
Go to the server, and search Services.
Ensure SQL Server and SQL Server Browser are running.
Go to C:\Windows\SysWOW64 and open SQLServerManager.msc
Under SQL Server Network Configuration, click on Protocol for SQL Server.
Ensure TCP/IP is enabled.
Under SQL Native Client Configuration, click Client Protocols.
Ensure TCP/IP is enabled.
