What is likely causing the timeouts?

By:
In: DBS-C01
Tagged:
With: 1 Comment
A database specialist deployed an Amazon RDS DB instance in Dev-VPC1 used by their development team.Dev-VPC1 has a peering connection with Dev-VPC2 that belongs to a different development team in the same department.The networking team confirmed that the routing between VPCs is correct; however, the database engineers in Dev-VPC2 are getting a timeout connections error when trying to connect to the database in Dev-VPC1.

What is likely causing the timeouts?

The database is deployed in a VPC that is in a different Region.

The database is deployed in a VPC that is in a different Availability Zone.

The database is deployed with misconfigured security groups.

The database is deployed with the wrong client connect timeout configuration.

Explanations:

The VPC peering connection is valid, so the Region is not the issue. RDS instances can span different VPCs within the same region.

Availability Zones (AZs) don’t impact VPC peering connectivity, and instances across AZs within the same region can communicate without issues.

Misconfigured security groups are a common cause for connectivity issues. If the RDS instance security group does not allow inbound traffic from the other VPC’s CIDR block, the connection will timeout.

Client connect timeout configuration is unlikely to be the root cause of the timeout. The issue is more likely related to network connectivity or security group settings.

2025-10-04

1 Comment

  1. Kimberly
    Author

    If I’m not mistaken, the answer is:
    The database is deployed with misconfigured security groups.

Leave a Reply

Your email address will not be published. Required fields are marked *

4 × two =