Sharepoint Cannot connect to database master at SQL Server

Cannot connect to database master at SQL Server at <server_name>. The database might not exist, or the current user does not have permission to connect to it. Apply to SharePoint 2010 and 2013

Issue:

I setup SharePoint server 2010 in farm. When I configure, I got error

Reasons and Solution

Check your firewall to turn of

Enable TCP/IP

Start All instance

The result.

Error is fixed.

Finished.