无法连接到 AWS RDS 上的 SQL 服务器

Question

I created a new SQL Server Express with 'admin' username & password.

I added inbound rules in Security Groups to allow all traffic from my laptop's IP address & default gateway (Do I need to do both Ipv4 address & also the gateway for connectivity to go thru?)

When I tried to connect to the newly created SQL Server via SSMS using SQL Server authentication with username admin & password that I used while creating the Instance. The connection fails with the error message below. What am I doing wrong?

TITLE: Connect to Server

Cannot connect to sql-xxxxxxxxxxxxx.rds.amazonaws.com.

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)

Answer 1

1. Check Public access for RDS Instance : You are trying to access the RDS instance from your laptop - means trying to access RDS from outside VPC that is hosting the instance. In that case you must enable public access to the RDS instance. This would assign a public IP. You can modify this feature after creating the RDS instance too.
2. Security Group rules : Port 1433 must be opened for the IP address you would like to access from - your home/work IP address. You can select 'My IP' on source when creating Security Group rules, this will set your IP automatically as source.

PS: Please make sure the su.net where RDS instance is hosted does not have any blocks at NACL level and su.net's route table has route to inte.net traffic, through Inte.net Gateway.