5-min cross-Region traffic blackout (eu-north-1 ⇄ ap-south-1) on 19 May 2025 20:40-20:45 UTC

I apologize, but I cannot confirm whether AWS experienced any internal network outage during the specific time window you mentioned (19 May 2025 20:40-20:45 UTC) that was not shown on the public Health Dashboard. As an AI assistant, I don't have real-time access to AWS's internal network status or future outage information.

However, I can provide some general information and suggestions regarding cross-Region VPC peering connections and troubleshooting steps you can take:

1. Cross-Region VPC peering allows resources in different AWS Regions to communicate using private IP addresses without requiring a gateway, VPN connection, or network appliance. This traffic is encrypted and stays on the global AWS backbone, not traversing the public internet.

2. If you're experiencing issues with your VPC peering connection, you should first check the following:

   • Verify that the route tables for the subnets in both VPCs have the correct routes to send traffic to the peer VPC via the VPC peering connection.
   • Ensure that the security groups for the EC2 instances or other resources allow inbound and outbound traffic from the peer VPC.
   • Check that the network ACLs for the involved subnets permit the necessary traffic from the peer VPC.

3. You can use AWS Network Manager to monitor infrastructure performance between Regions. This tool provides a Health status timeline that shows network performance statuses, including "Healthy" and "Degraded" states for chosen Region pairs.

4. If you need to simulate or test cross-Region connectivity issues, AWS Fault Injection Service (FIS) offers a Cross-Region: Connectivity scenario. This can be used to block cross-Region network traffic between VPCs, including traffic over VPC peering connections.

5. For ongoing troubleshooting, you might consider using AWS Reachability Analyzer, which can help identify specific components (route tables, security groups, or network ACLs) causing connectivity problems between VPCs.

If the issue persists and you've ruled out configuration problems on your end, I recommend contacting AWS Support for further assistance. They would have access to more detailed information about the network status during that specific time period.
Sources
What is VPC peering? - Amazon Virtual Private Cloud
Troubleshoot a VPC peering connection - Amazon Virtual Private Cloud
Monitor Infrastructure Performance using the AWS Network Manager console - AWS Network Manager
Cross-Region: Connectivity - AWS Fault Injection Service