https://blogs.msdn.microsoft.com/sql_protocols/2008/04/30/steps-to-troubleshoot-sql-connectivity-issues/
https://social.msdn.microsoft.com/Forums/sqlserver/en-US/e03993c0-a5f5-40c1-8124-c99b7866b933/steps-to-troubleshoot-sql-connectivity-issues?forum=sqldataaccess
https://social.msdn.microsoft.com/Forums/sqlserver/en-US/e03993c0-a5f5-40c1-8124-c99b7866b933/steps-to-troubleshoot-sql-connectivity-issues?forum=sqldataaccess
