SQL Server Database connection error on Amazon RDS

Creating Database using Amazon RDS is very eary.

See detailed documentation about creating a Microsoft SQL Server DB Instance and Connecting to a DB Instance

After that you can connect SQL Server from SQL Server Management Studio.

Amazon automatically configured Inbound permission to the IP from which it is created from.
While connecting from other PC or Hosting server you will receive bellow error:

A network-related or instance-specific error occurred while establishing a connection to SQL Server. The server was not found or was not accessible. Verify that the instance name is correct and that SQL Server is configured to allow remote connections. (provider: Named Pipes Provider, error: 40 - Could not open a connection to SQL Server) (Microsoft SQL Server, Error: 53)

 

Also connection Asp.net website you need to apply Connection String by:




Solution : 
 You need to apply  INBOUND rules for permission to that IP

In Security Group option

You can use WhatIsMyIp.com to get Source IP address.
Amazon has its own Check IP website : http://checkip.amazonaws.com/

Thanks