PS C:Usersadministrator.INTERNALDesktop> sqlcmd -S SQLMAINMSSQLSERVER -i rdmdb.sql
Sqlcmd: Error: Microsoft ODBC Driver 11 for SQL Server : SQL Server Network Interfaces: Connection string is not valid [
87]. .
Sqlcmd: Error: Microsoft ODBC Driver 11 for SQL Server : Login timeout expired.
Sqlcmd: Error: Microsoft ODBC Driver 11 for SQL Server : A network-related or instance-specific error has occurred while
 establishing a connection to SQL Server. Server is not found or not accessible. Check if instance name is correct and i
f SQL Server is configured to allow remote connections. For more information see SQL Server Books Online..