Help Center/ Relational Database Service_RDS for SQL Server/ FAQs/ Database Connection/ What Should I Do If My RDS for SQL Server Instance Fails to Be Connected Due to Database Client Problems?
Updated on 2025-06-30 GMT+08:00

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

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

  1. ECS Security Policy

    In Windows, check whether the RDS for SQL Server instance port is enabled in the Windows security policy. In Linux, run iptables to check whether the DB 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:

    Login failed for user 'username'

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