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Connecting Managed Grafana to Aurora PostgreSQL RDS database on a private subnet

Hello, I am trying to connect to an Aurora RDS cluster located in our private subnets from our managed grafana as a data source. I have created a Managed Grafana Interface VPC endpoint in the RDS cluster VPC, and for the same region our managed grafana was created at (for `com.amazonaws.us-east-2.grafana` service). I have also attached this endpoint to all the private subnets the RDS cluster's subnet group is configured on. When I test the connection to our RDS cluster in Grafana it fails with the following text: ``` <html> <head><title>504 Gateway Time-out</title></head> <body> <center><h1>504 Gateway Time-out</h1></center> </body> </html> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> Gateway Time-out ``` I'm specifying the endpoint and port of a reader instance, which otherwise being accessed from our bastion host is reachable. The reader instance's VPC security group allows TCP incoming traffic from `0.0.0.0/0` towards port `5432` and allows all outbound traffic. What could be the problem with my setup? Thank you for your time.
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asked 17 days ago