What Should I Do If an ECS Cannot Connect to an RDS DB Instance Through a Private Network?
Perform the following steps to identify the problem:
- Check whether the ECS and RDS DB instances are located in the same VPC.
- If they are in the same VPC, go to 2.
- If they are in different VPCs, create an ECS in the VPC in which the RDS DB instance is located.
- Check whether the security group rules of the ECS instance are appropriate.
For RDS for MySQL instances, see Configuring Security Group Rules. Then, go to 3.
- On the ECS, check whether the RDS DB instance port can be connected.
The default port of RDS for MySQL is 3306.
The default port of RDS for PostgreSQL is 5432.
The default port of RDS for SQL Server is 1433.
telnet <IP address> {port number}
- If the ECS can connect to the RDS DB instance port, the network between the ECS and the RDS DB instance is normal and no further action is required.
- If the ECS still cannot connect to the port, contact technical support.
Database Connection FAQs
- What Should I Do If I Can't Connect to My RDS DB Instance?
- Can an External Server Access the RDS Database?
- What Do I Do If the Number of RDS Database Connections Reaches the Upper Limit?
- What Is the Maximum Number of Connections to an RDS DB Instance?
- What Should I Do If an ECS Cannot Connect to an RDS DB Instance Through a Private Network?
- What Should I Do If a Database Client Problem Causes a Connection Failure?
- What Should I Do If an RDS Database Problem Causes a Connection Failure?
- How Do My Applications Access an RDS DB Instance in a VPC?
- Do Applications Need to Support Reconnecting to the RDS DB Instance Automatically?
- Why Can't I Ping My EIP After It Is Bound to a DB Instance?
- How Can I Obtain the IP Address of an Application?
- What Should I Do If an RDS for SQL Server DB Instance Failed to Be Connected?
- Can I Access an RDS DB Instance Over an Intranet Connection Across Regions?
- Is an SSL Connection to a DB Instance Interrupted After a Primary/Standby Switchover or Failover?
- Will My Access Be Restricted by Bandwidth When I Connect to My Instance from an ECS over a Private Network?
- Does RDS Support SSL Connections?
- Why Did the New Password Not Take Effect After I Reset the Administrator Password?
- Will I Be Logged Out If the Connection to RDS for SQL Server Instances Times Out?
- How Do I Set the Encoding Format of the MySQL 8.0 Character Set?
- What Should I Do If the ECS and RDS Are Deployed in Different VPCs and They Cannot Communicate with Each Other?
- How Do I View All IP Addresses Connected to a Database?
- Can I Access Standby RDS DB Instances?
- How Do I Check the Connections to an RDS for MySQL Instance?
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