Unable to connect AWS s3 machine

It seems you're experiencing connectivity issues with your EC2 instances rather than S3 (which is a storage service, not a compute instance).

Based on your description, there are several potential causes for your EC2 connection issues:

1. Security Group Configuration: Your instance's security group might not be properly configured to allow inbound SSH (port 22) or RDP (port 3389) traffic from your IP address. Since your IP might change over time, the initial connection works but fails later when your IP changes.

2. Network Settings: Verify that your instance is in a public subnet with an internet gateway attached. Without proper routing, your connection can fail.

3. Instance Health: Even though you're creating new instances, check if the status checks are passing. Failed status checks can indicate underlying issues with the instance.

4. EC2 Instance Connect IP Ranges: If you're using EC2 Instance Connect, ensure your security group allows inbound traffic from the EC2 Instance Connect service IP range for your specific region.

5. VPC Flow Logs: Consider enabling VPC flow logs on the network interface of your EC2 instance to diagnose potential network restrictions.

6. Firewall Settings: If you're on a corporate network, check if there are any firewall rules blocking outbound SSH or RDP connections after a certain period.

7. Network ACLs: Ensure that the Network ACLs associated with your instance's subnet allow both inbound and outbound traffic on the required ports.

To resolve this issue:

• Update your security group to allow traffic from a wider IP range or use an Elastic IP to maintain a consistent connection
• Try rebooting your instance if connection issues persist
• Consider using alternative connection methods like AWS Systems Manager Session Manager
• Check your local network settings for any timeout configurations

If these steps don't resolve the issue, you may need to contact AWS Support for more in-depth troubleshooting assistance.
Sources
Unable to connect to EC2 instance. | AWS re:Post
EC2 instance failed to connet | AWS re:Post
Cannot connect yo my instance anymore | AWS re:Post
EC2 Instance Connect cannot connect to my instance ! | AWS re:Post

Hello.

Are you running any time-consuming scripts or anything else within the EC2 instance?
If you're not running any scripts, then it's possible that the problem isn't with AWS, but with your local network, PC, or other environment.
So why not try switching PCs or networks and see what happens?