Why Am I Getting \"ERROR 2003 (HY000)\" When Connecting My EC2 Instance to My RDS Instance?

Troubleshooting Connection Issues between EC2 and RDS Instances

In the context of AWS, a common issue arises when attempting to establish a connection between an EC2 instance and an RDS instance. Users may experience the "ERROR 2003 (HY000)" when attempting to connect, despite having implemented security group permissions.

Root Cause:

The underlying issue often involves misconfigured inbound rules within the RDS security group, specifically for port 3306, which is the default port for MySQL connections.

Solution:

To resolve this issue, follow these steps:

1. Navigate to the AWS Management Console and select RDS.
2. Locate the RDS instance you are trying to connect to and click on it.
3. In the "Security" tab, locate the "Security Group Rules" section.
4. Click on the "Edit" button and select the "Inbound Rules" tab.
5. Add a new rule that allows access from the IP address or IPv4 CIDR block of your EC2 instance to port 3306.

Additional Considerations:

• Ensure that the security group of the EC2 instance has also been added to the inbound rules of the RDS security group.
• Verify that both the EC2 instance and RDS instance are running and in a healthy state.
• If the issue persists, consider checking any network firewalls or security appliances that may be blocking the connection.

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