Solve network Connection Issues between rds and app runner

I am looking for a skilled freelancer who can help me solve network connection issues between my RDS (Relational Database Service) and an app deployed on App Runner. I am experiencing a complete lack of connection between the two. The error: Unknown Host Error

Requirements:
- Experience in troubleshooting network connection issues
- Expertise in working with databases, specifically RDS
- Familiarity with App Runner and its integration with RDS
- Knowledge of VPC (Virtual Private Cloud) and VPC Connector
- Proficiency in diagnosing and resolving connectivity problems in a VPC environment

Skills:
- Networking
- Database management
- Troubleshooting
- VPC configuration

If you have the necessary skills and experience, please reach out to discuss the project further.