Cannot connect to AWS RDS DB Instance from EC2 instance

Question

ERROR 2003 (HY000): Can't connect to MySQL server on 'xyz.cdhtaamn5ynq.us-east-1.rds.amazonaws.com' (110)

I enabled Public Accessible while creating RDS DB Instance. I opened 3306 port in EC2 instance security group. I commented binding-address=localhost in /etc/mysql/mysql.conf.d/mysqld.cnf file. I cannot able to connect RDS through EC2 instance. Please help me. Thanks in advance.

Answer 1

Even with publicly available checked -- your RDS instance is still launched into a Security Group. I would look at the inbound rules on this security group to ensure that traffic is allowed from your ec2 instance.