What Should I Do If My RDS Instance Fails to Be Connected Due to Database Client Problems?

Troubleshoot RDS connection failures caused by a client problem by checking the following items:

1. ECS Security Policy

   In Windows, check whether the RDS instance port is enabled in the Windows security policy. In Linux, run iptables to check whether the RDS instance port is enabled in firewall settings.

2. Application Configuration

   Check whether the connection address, port parameter configuration, and JDBC connection parameter configuration are correct.

3. Username or Password

   Check whether the username or password is correct if an error similar to the following occurs during RDS DB connection:

   • [Warning] Access denied for user 'username'@'yourIp' (using password: NO)
   • [Warning] Access denied for user 'username'@'yourIp' (using password: YES)
   • Login failed for user 'username'

If the problem persists, contact post-sales technical support.