Cannot connect to database master

While running psconfig wizard got error as "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"

Error:

"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" 

Solution:

Open the Windows Firewall with Advanced Services and add an inbound rule to allow traffic over port 1433.