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Where are you connecting to RDS from?
For access from outside the VPC, public access must be configured in RDS.
For access from a VPC other than the RDS, configure VPC peering and configure the route table.
https://docs.aws.amazon.com/vpc/latest/peering/create-vpc-peering-connection.html
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I do not believe control tower is playing any part. The the issue will be related to networking.
Be that routing, NACLs and or security groups.
Without knowing your network connectivity I would start looking there.
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I have public access on the rds instance and am trying to connect from pgadmin on my local machine. Nothing fancy with the my set up. Tried several times with no luck. Would love the help to figure this out. I can connect with no issues from my main account, I compared the default vpc and security group in main account to the control tower account vpc and sec grp. I didn't see any difference can't really see what it could be thats causing the issue.
What IP address do you see when you name resolve the RDS DNS name from your PC? For example, you can view it with the following command.
Also, could you please share the full error text of your attempt to connect?