RDP connection problem

I understand you're having trouble connecting to your EC2 instance via RDP after creating a VPC and launching the instance. This is a common issue that can occur due to various reasons. Let's go through some troubleshooting steps to help resolve your RDP connection problem:

1. Verify security group rules: Ensure that the security group associated with your instance allows incoming RDP traffic (port 3389) from your IP address. The default security group for a VPC doesn't allow incoming RDP traffic by default, so you may need to add a rule to allow it.

2. Check instance state: Verify that your instance is in the "running" state and has passed all status checks in the EC2 console.

3. Confirm public IP address: Make sure your instance has a public IPv4 address assigned if you're trying to connect from outside the VPC.

4. Windows Firewall: The Windows Firewall on the instance might be blocking RDP connections. You may need to disable or configure it properly.

5. Network connectivity: Ensure that your VPC's route tables and network ACLs are configured correctly to allow traffic to and from your instance.

6. RDP service: Verify that the Remote Desktop service is running on your instance.

7. Administrator password: If you're using the auto-generated password, make sure you've waited at least 4 minutes after launching the instance before trying to retrieve it. If you're still having issues, you may need to reset the administrator password.

8. Instance type change: If you recently changed the instance type, you might need to install the correct network adapter driver to enable RDP connections.

If these steps don't resolve the issue, you may want to consider using AWS Systems Manager Session Manager as an alternative method to access your instance and troubleshoot further.

Remember to always back up your data and create snapshots of your volumes before making significant changes to your instance configuration.
Sources
Troubleshoot an RDP connection on Windows Server after EC2 change | AWS re:Post
Troubleshoot issues connecting to your Amazon EC2 Linux instance - Amazon Elastic Compute Cloud
RDP not working and need to access ec2 instance | AWS re:Post
Troubleshoot issues connecting to your Amazon EC2 Windows instance - Amazon Elastic Compute Cloud